MCQ
What volume of decimolar solution should be mixed in a solution of same solute $(0.5 \,M,\,200\, ml)$ to make it $0.25\,molar$ ........ $ml$.
- ✓$333.33$
- B$500$
- C$233.33$
- D$133.33$
✓
Answer
Correct option: A.
$333.33$
a
${{\text{M}}_1}{{\text{V}}_1} + {{\text{M}}_2}{{\text{V}}_2}$ $ = {{\text{M}}_3}\left( {{{\text{V}}_1} + {{\text{V}}_1}} \right)$
${{\text{M}}_1}{{\text{V}}_1} + {{\text{M}}_2}{{\text{V}}_2}$ $ = {{\text{M}}_3}\left( {{{\text{V}}_1} + {{\text{V}}_1}} \right)$
$0.1\, \mathrm{V}+0.5 \times 200=0.25(200+\mathrm{V})$
$\mathrm{V}=333.33\,\mathrm{ml}$
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