<p>
根据c=n/v<br>
所以n=c*v<br>
n<sub>1</sub>=c<sub>1</sub>*v<sub>1</sub>=0.5450mol/L*（100ml/1000）L=0.05450mol<br>
n<sub>1</sub>=n<sub>2</sub><br>
c=n/v<br>
所以v=n/c<br>
v<sub>2</sub>=n<sub>1</sub>/c<sub>2</sub>=0.05450mol/0.5000mol/L=0.109L=109ml<br>
v<sub>3</sub>=V<sub>2</sub>-V<sub>1</sub>=109-100=9ml<br>
需加水9ml。</p>
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