MCQ
......$L$ litres of water must be added to $1\, litre$ an aqueous solution of $HCl$ with a $pH$ of $1$ to create an aqueous solution with $pH$ of $2$ ?
- A$0.1$
- B$0.9$
- C$2$
- ✓$9$
✓
Answer
Correct option: D.
$9$
d
As $p H=1 ; H^{+}=10^{-1}=0.1 \,M$
As $p H=1 ; H^{+}=10^{-1}=0.1 \,M$
$p H=2 ; H^{+}=10^{-2}=0.01\, M$
$\therefore M_{1}=0.1 ; V_{1}=1$
$M_{2}=0.01; V_{2}=?$
From
$M_{1} V_{1}=M_{2} V_{2} ; 0.1 \times 1=0.01 \times V_{2}$
$V_{2}=10$ litre
volume of water added $=10-1=9$ litre.
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