Bài 43: Pha chế dung dịch
Hướng dẫn giải Bài 4 (Trang 149 SGK Hóa học lớp 8)
<p>Hãy điền những giá trị chưa biết vào những ô để trống trong bảng, bằng cách thực hiện các tính toán theo mỗi cột:</p>
<table style="border-collapse: collapse; width: 66.1169%; height: 284.844px;" border="1">
<tbody>
<tr style="height: 69.2344px;">
<td style="width: 16.4402%; height: 69.2344px;">Đại lượng</td>
<td style="width: 16.712%; text-align: center; height: 69.2344px;">
<p>NaCl</p>
<p>(a)</p>
</td>
<td style="width: 16.5761%; text-align: center; height: 69.2344px;">
<p>Ca(OH)<sub>2</sub></p>
<p>(b)</p>
</td>
<td style="width: 16.712%; text-align: center; height: 69.2344px;">
<p>BaCl<sub>2</sub></p>
<p>(c)</p>
</td>
<td style="width: 16.712%; text-align: center; height: 69.2344px;">
<p>KOH</p>
<p>(d)</p>
</td>
<td style="width: 16.8478%; text-align: center; height: 69.2344px;">
<p>CuSO<sub>4</sub></p>
<p>(e)</p>
</td>
</tr>
<tr style="height: 29.1719px;">
<td style="width: 16.4402%; height: 29.1719px; text-align: center;">m<sub>ct</sub></td>
<td style="width: 16.712%; height: 29.1719px; text-align: center;">30 g</td>
<td style="width: 16.5761%; height: 29.1719px; text-align: center;">0,148 g</td>
<td style="width: 16.712%; height: 29.1719px; text-align: center;"> </td>
<td style="width: 16.712%; height: 29.1719px; text-align: center;"> </td>
<td style="width: 16.8478%; height: 29.1719px; text-align: center;">3 g</td>
</tr>
<tr style="height: 30.3438px;">
<td style="width: 16.4402%; height: 30.3438px; text-align: center;"><math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi mathvariant="normal">m</mi><mrow><msub><mi mathvariant="normal">H</mi><mn>2</mn></msub><mi mathvariant="normal">O</mi></mrow></msub></math></td>
<td style="width: 16.712%; height: 30.3438px; text-align: center;">170 g</td>
<td style="width: 16.5761%; height: 30.3438px; text-align: center;"> </td>
<td style="width: 16.712%; height: 30.3438px; text-align: center;"> </td>
<td style="width: 16.712%; height: 30.3438px; text-align: center;"> </td>
<td style="width: 16.8478%; height: 30.3438px; text-align: center;"> </td>
</tr>
<tr style="height: 26.1406px;">
<td style="width: 16.4402%; height: 26.1406px; text-align: center;">m<sub>dd</sub></td>
<td style="width: 16.712%; height: 26.1406px; text-align: center;"> </td>
<td style="width: 16.5761%; height: 26.1406px; text-align: center;"> </td>
<td style="width: 16.712%; height: 26.1406px; text-align: center;">150 g</td>
<td style="width: 16.712%; height: 26.1406px; text-align: center;"> </td>
<td style="width: 16.8478%; height: 26.1406px; text-align: center;"> </td>
</tr>
<tr style="height: 26.1406px;">
<td style="width: 16.4402%; height: 26.1406px; text-align: center;">V<sub>dd</sub></td>
<td style="width: 16.712%; height: 26.1406px; text-align: center;"> </td>
<td style="width: 16.5761%; height: 26.1406px; text-align: center;">200 ml</td>
<td style="width: 16.712%; height: 26.1406px; text-align: center;"> </td>
<td style="width: 16.712%; height: 26.1406px; text-align: center;">300 ml</td>
<td style="width: 16.8478%; height: 26.1406px; text-align: center;"> </td>
</tr>
<tr style="height: 54.9219px;">
<td style="width: 16.4402%; height: 54.9219px; text-align: center;">D<sub>dd</sub> (g/ml)</td>
<td style="width: 16.712%; height: 54.9219px; text-align: center;">1,1</td>
<td style="width: 16.5761%; height: 54.9219px; text-align: center;">1</td>
<td style="width: 16.712%; height: 54.9219px; text-align: center;">1,2</td>
<td style="width: 16.712%; height: 54.9219px; text-align: center;">1,04</td>
<td style="width: 16.8478%; height: 54.9219px; text-align: center;">
<p>1,15</p>
</td>
</tr>
<tr style="height: 22.6719px;">
<td style="width: 16.4402%; height: 22.6719px; text-align: center;">C%</td>
<td style="width: 16.712%; height: 22.6719px; text-align: center;"> </td>
<td style="width: 16.5761%; height: 22.6719px; text-align: center;"> </td>
<td style="width: 16.712%; height: 22.6719px; text-align: center;">20%</td>
<td style="width: 16.712%; height: 22.6719px; text-align: center;"> </td>
<td style="width: 16.8478%; height: 22.6719px; text-align: center;">15 %</td>
</tr>
<tr style="height: 26.2188px;">
<td style="width: 16.4402%; height: 26.2188px; text-align: center;">C<sub>M</sub></td>
<td style="width: 16.712%; height: 26.2188px; text-align: center;"> </td>
<td style="width: 16.5761%; height: 26.2188px; text-align: center;"> </td>
<td style="width: 16.712%; height: 26.2188px; text-align: center;"> </td>
<td style="width: 16.712%; height: 26.2188px; text-align: center;">2,5M</td>
<td style="width: 16.8478%; height: 26.2188px; text-align: center;"> </td>
</tr>
</tbody>
</table>
<p><strong>Giải</strong></p>
<table style="border-collapse: collapse; width: 66.3629%; height: 310.828px;" border="1">
<tbody>
<tr style="height: 54.3906px;">
<td style="width: 19.4417%; height: 54.3906px; text-align: center;"><strong>Đại lượng</strong></td>
<td style="width: 80.5423%; text-align: center; height: 54.3906px;">
<p><strong>NaCl(a)</strong></p>
</td>
</tr>
<tr style="height: 29.1719px;">
<td style="width: 19.4417%; height: 29.1719px; text-align: center;">m<sub>ct</sub></td>
<td style="width: 80.5423%; height: 29.1719px;">30 g</td>
</tr>
<tr style="height: 30.3438px;">
<td style="width: 19.4417%; height: 30.3438px; text-align: center;"><math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi mathvariant="normal">m</mi><mrow><msub><mi mathvariant="normal">H</mi><mn>2</mn></msub><mi mathvariant="normal">O</mi></mrow></msub></math></td>
<td style="width: 80.5423%; height: 30.3438px;">170 g</td>
</tr>
<tr style="height: 30px;">
<td style="width: 19.4417%; height: 30px; text-align: center;">m<sub>dd</sub></td>
<td style="width: 80.5423%; height: 30px;">m<sub>dd </sub>= m<sub>ct</sub> + <math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi mathvariant="normal">m</mi><mrow><msub><mi mathvariant="normal">H</mi><mn>2</mn></msub><mi mathvariant="normal">O</mi></mrow></msub></math> = 30+170 = 200 g</td>
</tr>
<tr style="height: 47px;">
<td style="width: 19.4417%; height: 47px; text-align: center;">V<sub>dd</sub></td>
<td style="width: 80.5423%; height: 47px;"><math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi mathvariant="normal">V</mi><mi>dd</mi></msub><mo>=</mo><mfrac><msub><mi mathvariant="normal">m</mi><mi>dd</mi></msub><mi mathvariant="normal">D</mi></mfrac><mo>=</mo><mfrac><mn>200</mn><mrow><mn>1</mn><mo>,</mo><mn>1</mn></mrow></mfrac><mo>=</mo><mn>182</mn></math> (ml)</td>
</tr>
<tr style="height: 20.9219px;">
<td style="width: 19.4417%; height: 20.9219px; text-align: center;">D<sub>dd</sub> (g/ml)</td>
<td style="width: 80.5423%; height: 20.9219px;">1,1</td>
</tr>
<tr style="height: 51px;">
<td style="width: 19.4417%; height: 51px; text-align: center;">C%</td>
<td style="width: 80.5423%; height: 51px;"><math xmlns="http://www.w3.org/1998/Math/MathML"><mi mathvariant="normal">C</mi><mo>%</mo><mo>=</mo><mfrac><msub><mi mathvariant="normal">m</mi><mi>ct</mi></msub><msub><mi mathvariant="normal">m</mi><mi>dd</mi></msub></mfrac><mo>.</mo><mn>100</mn><mo>%</mo><mo>=</mo><mfrac><mn>30</mn><mn>200</mn></mfrac><mo>.</mo><mn>100</mn><mo>%</mo><mo>=</mo><mn>15</mn><mo>%</mo></math></td>
</tr>
<tr style="height: 48px;">
<td style="width: 19.4417%; height: 48px; text-align: center;">C<sub>M</sub></td>
<td style="width: 80.5423%; height: 48px;"><math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi mathvariant="normal">C</mi><mi mathvariant="normal">M</mi></msub><mo>=</mo><mfrac><mi mathvariant="normal">n</mi><mi mathvariant="normal">V</mi></mfrac><mo>=</mo><mfrac><mrow><msub><mi mathvariant="normal">m</mi><mi>ct</mi></msub><mo>/</mo><mi mathvariant="normal">M</mi></mrow><mi mathvariant="normal">V</mi></mfrac><mo>=</mo><mfrac><mrow><mn>30</mn><mo>/</mo><mo>(</mo><mn>23</mn><mo>+</mo><mn>35</mn><mo>,</mo><mn>5</mn><mo>)</mo></mrow><mrow><mn>0</mn><mo>,</mo><mn>182</mn></mrow></mfrac><mo>=</mo><mn>2</mn><mo>,</mo><mn>8</mn><mo> </mo><mo>(</mo><mi mathvariant="normal">M</mi><mo>)</mo></math></td>
</tr>
</tbody>
</table>
<p> </p>
<table style="border-collapse: collapse; width: 66.3629%; height: 310.828px;" border="1">
<tbody>
<tr style="height: 54.3906px;">
<td style="width: 19.4417%; height: 54.3906px; text-align: center;"><strong>Đại lượng</strong></td>
<td style="width: 80.5423%; height: 54.3906px; text-align: center;">
<p><strong>Ca(OH)<sub>2 </sub>(b)</strong></p>
</td>
</tr>
<tr style="height: 29.1719px;">
<td style="width: 19.4417%; height: 29.1719px; text-align: center;">m<sub>ct</sub></td>
<td style="width: 80.5423%; height: 29.1719px;">0,148 g</td>
</tr>
<tr style="height: 30.3438px;">
<td style="width: 19.4417%; height: 30.3438px; text-align: center;"><math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi mathvariant="normal">m</mi><mrow><msub><mi mathvariant="normal">H</mi><mn>2</mn></msub><mi mathvariant="normal">O</mi></mrow></msub></math></td>
<td style="width: 80.5423%; height: 30.3438px;"><math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi mathvariant="normal">m</mi><mrow><msub><mi mathvariant="normal">H</mi><mn>2</mn></msub><mi mathvariant="normal">O</mi></mrow></msub></math> = m<sub>dd </sub>- m<sub>ct</sub> = 200-0,148 = 199,852 g</td>
</tr>
<tr style="height: 30px;">
<td style="width: 19.4417%; height: 30px; text-align: center;">m<sub>dd</sub></td>
<td style="width: 80.5423%; height: 30px;">m<sub>dd </sub>= D.V = 200.1 = 200 g</td>
</tr>
<tr style="height: 47px;">
<td style="width: 19.4417%; height: 47px; text-align: center;">V<sub>dd</sub></td>
<td style="width: 80.5423%; height: 47px;">200 ml</td>
</tr>
<tr style="height: 20.9219px;">
<td style="width: 19.4417%; height: 20.9219px; text-align: center;">D<sub>dd</sub> (g/ml)</td>
<td style="width: 80.5423%; height: 20.9219px;">1</td>
</tr>
<tr style="height: 51px;">
<td style="width: 19.4417%; height: 51px; text-align: center;">C%</td>
<td style="width: 80.5423%; height: 51px;"><math xmlns="http://www.w3.org/1998/Math/MathML"><mi mathvariant="normal">C</mi><mo>%</mo><mo>=</mo><mfrac><msub><mi mathvariant="normal">m</mi><mi>ct</mi></msub><msub><mi mathvariant="normal">m</mi><mi>dd</mi></msub></mfrac><mo>.</mo><mn>100</mn><mo>%</mo><mo>=</mo><mfrac><mrow><mn>0</mn><mo>,</mo><mn>148</mn></mrow><mn>200</mn></mfrac><mo>.</mo><mn>100</mn><mo>%</mo><mo>=</mo><mn>7</mn><mo>,</mo><mn>4</mn><mo>.</mo><msup><mn>10</mn><mrow><mo>-</mo><mn>4</mn></mrow></msup><mo>%</mo></math></td>
</tr>
<tr style="height: 48px;">
<td style="width: 19.4417%; height: 48px; text-align: center;">C<sub>M</sub></td>
<td style="width: 80.5423%; height: 48px;"><math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi mathvariant="normal">C</mi><mi mathvariant="normal">M</mi></msub><mo>=</mo><mfrac><mi mathvariant="normal">n</mi><mi mathvariant="normal">V</mi></mfrac><mo>=</mo><mfrac><mrow><msub><mi mathvariant="normal">m</mi><mi>ct</mi></msub><mo>/</mo><mi mathvariant="normal">M</mi></mrow><mi mathvariant="normal">V</mi></mfrac><mo>=</mo><mfrac><mrow><mn>0</mn><mo>,</mo><mn>148</mn><mo>/</mo><mo>(</mo><mn>40</mn><mo>+</mo><mn>16</mn><mo>.</mo><mn>2</mn><mo>+</mo><mn>2</mn><mo>.</mo><mn>1</mn><mo>)</mo></mrow><mrow><mn>0</mn><mo>,</mo><mn>2</mn></mrow></mfrac><mo>=</mo><mn>0</mn><mo>,</mo><mn>01</mn><mo> </mo><mo>(</mo><mi mathvariant="normal">M</mi><mo>)</mo></math></td>
</tr>
</tbody>
</table>
<p> </p>
<table style="border-collapse: collapse; width: 66.3629%; height: 310.828px;" border="1">
<tbody>
<tr style="height: 54.3906px;">
<td style="width: 19.4417%; height: 54.3906px; text-align: center;"><strong>Đại lượng</strong></td>
<td style="width: 80.5423%; text-align: center; height: 54.3906px;">
<p><strong>BaCl<sub>2</sub>(c)</strong></p>
</td>
</tr>
<tr style="height: 29.1719px;">
<td style="width: 19.4417%; height: 29.1719px; text-align: center;">m<sub>ct</sub></td>
<td style="width: 80.5423%; height: 29.1719px;"><math xmlns="http://www.w3.org/1998/Math/MathML"><mi mathvariant="normal">C</mi><mo>%</mo><mo>=</mo><mfrac><msub><mi mathvariant="normal">m</mi><mi>ct</mi></msub><msub><mi mathvariant="normal">m</mi><mi>dd</mi></msub></mfrac><mo>.</mo><mn>100</mn><mo>%</mo><mo> </mo><mo>⇒</mo><msub><mi mathvariant="normal">m</mi><mi>ct</mi></msub><mo>=</mo><mfrac><mrow><mi mathvariant="normal">C</mi><mo>%</mo><mo>.</mo><msub><mi mathvariant="normal">m</mi><mi>dd</mi></msub></mrow><mrow><mn>100</mn><mo>%</mo></mrow></mfrac><mo>=</mo><mfrac><mrow><mn>20</mn><mo>%</mo><mo>.</mo><mn>150</mn></mrow><mrow><mn>100</mn><mo>%</mo></mrow></mfrac><mo>=</mo><mn>30</mn></math>g</td>
</tr>
<tr style="height: 30.3438px;">
<td style="width: 19.4417%; height: 30.3438px; text-align: center;"><math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi mathvariant="normal">m</mi><mrow><msub><mi mathvariant="normal">H</mi><mn>2</mn></msub><mi mathvariant="normal">O</mi></mrow></msub></math></td>
<td style="width: 80.5423%; height: 30.3438px;"><math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi mathvariant="normal">m</mi><mrow><msub><mi mathvariant="normal">H</mi><mn>2</mn></msub><mi mathvariant="normal">O</mi></mrow></msub></math> = m<sub>dd </sub>- m<sub>ct</sub> = 150-30 = 120 g</td>
</tr>
<tr style="height: 30px;">
<td style="width: 19.4417%; height: 30px; text-align: center;">m<sub>dd</sub></td>
<td style="width: 80.5423%; height: 30px;">150 g</td>
</tr>
<tr style="height: 47px;">
<td style="width: 19.4417%; height: 47px; text-align: center;">V<sub>dd</sub></td>
<td style="width: 80.5423%; height: 47px;">mdd=D.V<sub>dd</sub><math xmlns="http://www.w3.org/1998/Math/MathML"><mo>⇒</mo></math><math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi mathvariant="normal">V</mi><mi>dd</mi></msub><mo>=</mo><mfrac><msub><mi mathvariant="normal">m</mi><mi>dd</mi></msub><mi mathvariant="normal">D</mi></mfrac><mo>=</mo><mfrac><mn>150</mn><mrow><mn>1</mn><mo>,</mo><mn>2</mn></mrow></mfrac><mo>=</mo><mn>125</mn></math> (ml)</td>
</tr>
<tr style="height: 20.9219px;">
<td style="width: 19.4417%; height: 20.9219px; text-align: center;">D<sub>dd</sub> (g/ml)</td>
<td style="width: 80.5423%; height: 20.9219px;">1,2</td>
</tr>
<tr style="height: 51px;">
<td style="width: 19.4417%; height: 51px; text-align: center;">C%</td>
<td style="width: 80.5423%; height: 51px;">20%</td>
</tr>
<tr style="height: 48px;">
<td style="width: 19.4417%; height: 48px; text-align: center;">C<sub>M</sub></td>
<td style="width: 80.5423%; height: 48px;"><math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi mathvariant="normal">C</mi><mi mathvariant="normal">M</mi></msub><mo>=</mo><mfrac><mi mathvariant="normal">n</mi><mi mathvariant="normal">V</mi></mfrac><mo>=</mo><mfrac><mrow><msub><mi mathvariant="normal">m</mi><mi>ct</mi></msub><mo>/</mo><mi mathvariant="normal">M</mi></mrow><mi mathvariant="normal">V</mi></mfrac><mo>=</mo><mfrac><mrow><mn>30</mn><mo>/</mo><mo>(</mo><mn>137</mn><mo>+</mo><mn>35</mn><mo>,</mo><mn>5</mn><mo>.</mo><mn>2</mn><mo>)</mo></mrow><mrow><mn>0</mn><mo>,</mo><mn>125</mn></mrow></mfrac><mo>=</mo><mn>1</mn><mo>,</mo><mn>153</mn><mo> </mo><mo>(</mo><mi mathvariant="normal">M</mi><mo>)</mo></math></td>
</tr>
</tbody>
</table>
<p> </p>
<table style="border-collapse: collapse; width: 66.3629%; height: 310.828px;" border="1">
<tbody>
<tr style="height: 54.3906px;">
<td style="width: 19.4417%; height: 54.3906px; text-align: center;"><strong>Đại lượng</strong></td>
<td style="width: 80.5423%; text-align: center; height: 54.3906px;">
<p><strong>KOH(d)</strong></p>
</td>
</tr>
<tr style="height: 29.1719px;">
<td style="width: 19.4417%; height: 29.1719px; text-align: center;">m<sub>ct</sub></td>
<td style="width: 80.5423%; height: 29.1719px;"><math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi mathvariant="normal">C</mi><mi mathvariant="normal">M</mi></msub><mo>=</mo><mfrac><msub><mi mathvariant="normal">n</mi><mi>ct</mi></msub><msub><mi mathvariant="normal">V</mi><mi>dd</mi></msub></mfrac><mo>⇒</mo><msub><mi mathvariant="normal">n</mi><mi>ct</mi></msub><mo>=</mo><msub><mi mathvariant="normal">C</mi><mi mathvariant="normal">M</mi></msub><mo>.</mo><msub><mi mathvariant="normal">V</mi><mi>dd</mi></msub><mo>=</mo><mn>2</mn><mo>,</mo><mn>5</mn><mo>.</mo><mn>0</mn><mo>,</mo><mn>3</mn><mo> </mo><mo>=</mo><mn>0</mn><mo>,</mo><mn>75</mn><mo> </mo><mo>(</mo><mi>mol</mi><mo>)</mo><mspace linebreak="newline"/><mo>⇒</mo><msub><mi mathvariant="normal">m</mi><mi>ct</mi></msub><mo> </mo><mo>=</mo><mo> </mo><msub><mi mathvariant="normal">n</mi><mi>ct</mi></msub><mo>.</mo><mi mathvariant="normal">M</mi><mo> </mo><mo>=</mo><mo> </mo><mn>0</mn><mo>,</mo><mn>75</mn><mo>.</mo><mo>(</mo><mn>39</mn><mo>+</mo><mn>16</mn><mo>+</mo><mn>1</mn><mo>)</mo><mo>=</mo><mn>42</mn><mo> </mo><mi mathvariant="normal">g</mi></math></td>
</tr>
<tr style="height: 30.3438px;">
<td style="width: 19.4417%; height: 30.3438px; text-align: center;"><math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi mathvariant="normal">m</mi><mrow><msub><mi mathvariant="normal">H</mi><mn>2</mn></msub><mi mathvariant="normal">O</mi></mrow></msub></math></td>
<td style="width: 80.5423%; height: 30.3438px;"><math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi mathvariant="normal">m</mi><mrow><msub><mi mathvariant="normal">H</mi><mn>2</mn></msub><mi mathvariant="normal">O</mi></mrow></msub></math> = m<sub>dd </sub>- m<sub>ct</sub> = 312-42 = 270 g</td>
</tr>
<tr style="height: 30px;">
<td style="width: 19.4417%; height: 30px; text-align: center;">m<sub>dd</sub></td>
<td style="width: 80.5423%; height: 30px;">mdd=D.Vdd = 1,04.300 = 312g</td>
</tr>
<tr style="height: 47px;">
<td style="width: 19.4417%; height: 47px; text-align: center;">V<sub>dd</sub></td>
<td style="width: 80.5423%; height: 47px;">300 ml</td>
</tr>
<tr style="height: 20.9219px;">
<td style="width: 19.4417%; height: 20.9219px; text-align: center;">D<sub>dd</sub> (g/ml)</td>
<td style="width: 80.5423%; height: 20.9219px;">1,04</td>
</tr>
<tr style="height: 51px;">
<td style="width: 19.4417%; height: 51px; text-align: center;">C%</td>
<td style="width: 80.5423%; height: 51px;"><math xmlns="http://www.w3.org/1998/Math/MathML"><mi mathvariant="normal">C</mi><mo>%</mo><mo>=</mo><mfrac><msub><mi mathvariant="normal">m</mi><mi>ct</mi></msub><msub><mi mathvariant="normal">m</mi><mi>dd</mi></msub></mfrac><mo>.</mo><mn>100</mn><mo>%</mo><mo>=</mo><mfrac><mn>42</mn><mn>312</mn></mfrac><mo>.</mo><mn>100</mn><mo>=</mo><mn>13</mn><mo>,</mo><mn>46</mn><mo>%</mo></math></td>
</tr>
<tr style="height: 48px;">
<td style="width: 19.4417%; height: 48px; text-align: center;">C<sub>M</sub></td>
<td style="width: 80.5423%; height: 48px;">2,5M</td>
</tr>
</tbody>
</table>
<p> </p>
<table style="border-collapse: collapse; width: 66.3629%; height: 344.422px;" border="1">
<tbody>
<tr style="height: 57.8438px;">
<td style="width: 19.4417%; height: 57.8438px; text-align: center;"><strong>Đại lượng</strong></td>
<td style="width: 80.5423%; text-align: center; height: 57.8438px;">
<p><strong>CuSO<sub>4</sub>(e)</strong></p>
</td>
</tr>
<tr style="height: 54.3906px;">
<td style="width: 19.4417%; height: 54.3906px; text-align: center;">m<sub>ct</sub></td>
<td style="width: 80.5423%; height: 54.3906px;">
<p>3 g</p>
</td>
</tr>
<tr style="height: 30.3438px;">
<td style="width: 19.4417%; height: 30.3438px; text-align: center;"><math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi mathvariant="normal">m</mi><mrow><msub><mi mathvariant="normal">H</mi><mn>2</mn></msub><mi mathvariant="normal">O</mi></mrow></msub></math></td>
<td style="width: 80.5423%; height: 30.3438px;"><math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi mathvariant="normal">m</mi><mrow><msub><mi mathvariant="normal">H</mi><mn>2</mn></msub><mi mathvariant="normal">O</mi></mrow></msub></math> = m<sub>dd </sub>- m<sub>ct</sub> = 20-3 = 17 g</td>
</tr>
<tr style="height: 30px;">
<td style="width: 19.4417%; height: 30px; text-align: center;">m<sub>dd</sub></td>
<td style="width: 80.5423%; height: 30px;"><math xmlns="http://www.w3.org/1998/Math/MathML"><mi mathvariant="normal">C</mi><mo>%</mo><mo>=</mo><mfrac><msub><mi mathvariant="normal">m</mi><mi>ct</mi></msub><msub><mi mathvariant="normal">m</mi><mi>dd</mi></msub></mfrac><mo>.</mo><mn>100</mn><mo>%</mo><mo> </mo><mo>⇒</mo><msub><mi mathvariant="normal">m</mi><mi>dd</mi></msub><mo>=</mo><mfrac><mrow><msub><mi mathvariant="normal">m</mi><mi>ct</mi></msub><mo>.</mo><mn>100</mn></mrow><mrow><mi mathvariant="normal">C</mi><mo>%</mo></mrow></mfrac><mo>=</mo><mfrac><mrow><mn>3</mn><mo>.</mo><mn>100</mn></mrow><mn>15</mn></mfrac><mo>=</mo><mn>20</mn><mi mathvariant="normal">g</mi></math></td>
</tr>
<tr style="height: 47px;">
<td style="width: 19.4417%; height: 47px; text-align: center;">V<sub>dd</sub></td>
<td style="width: 80.5423%; height: 47px;">m<sub>dd</sub>=D.V<sub>dd</sub><math xmlns="http://www.w3.org/1998/Math/MathML"><mo>⇒</mo></math><math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi mathvariant="normal">V</mi><mi>dd</mi></msub><mo>=</mo><mfrac><msub><mi mathvariant="normal">m</mi><mi>dd</mi></msub><mi mathvariant="normal">D</mi></mfrac><mo>=</mo><mfrac><mn>20</mn><mrow><mn>1</mn><mo>,</mo><mn>05</mn></mrow></mfrac><mo>=</mo><mn>19</mn><mo> </mo><mi>ml</mi></math></td>
</tr>
<tr style="height: 25.8438px;">
<td style="width: 19.4417%; height: 25.8438px; text-align: center;">D<sub>dd</sub> (g/ml)</td>
<td style="width: 80.5423%; height: 25.8438px;">1,05</td>
</tr>
<tr style="height: 51px;">
<td style="width: 19.4417%; height: 51px; text-align: center;">C%</td>
<td style="width: 80.5423%; height: 51px;">15%</td>
</tr>
<tr style="height: 48px;">
<td style="width: 19.4417%; height: 48px; text-align: center;">C<sub>M</sub></td>
<td style="width: 80.5423%; height: 48px;"><math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi mathvariant="normal">C</mi><mi mathvariant="normal">M</mi></msub><mo>=</mo><mfrac><mi mathvariant="normal">n</mi><mi mathvariant="normal">V</mi></mfrac><mo>=</mo><mfrac><mrow><msub><mi mathvariant="normal">m</mi><mi>ct</mi></msub><mo>/</mo><mi mathvariant="normal">M</mi></mrow><mi mathvariant="normal">V</mi></mfrac><mo>=</mo><mfrac><mrow><mn>3</mn><mo>/</mo><mo>(</mo><mn>64</mn><mo>+</mo><mn>32</mn><mo>+</mo><mn>16</mn><mo>.</mo><mn>4</mn><mo>)</mo></mrow><mrow><mn>0</mn><mo>,</mo><mn>019</mn></mrow></mfrac><mo>=</mo><mn>1</mn><mo>(</mo><mi mathvariant="normal">M</mi><mo>)</mo></math></td>
</tr>
</tbody>
</table>
Giải bài tập 4 (trang 149 SGK Hóa học 8)
GV: 
GV colearn
GV colearn
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Giải bài tập 4 (trang 149 SGK Hóa học 8)
GV: GV colearn
GV colearn