MCQ
The $pH$ of two equimolar weak acids are $3.0$ and $5.0$ respectively. Their relative strength is
- A$3:5$
- B$5:3$
- ✓$100:1$
- D$1:100$
✓
Answer
Correct option: C.
$100:1$
c
The relative strength of acids $=$ ratio of hydrogen ion concentration
The relative strength of acids $=$ ratio of hydrogen ion concentration
When $pH =3.0,\left[ H ^{+}\right]=10^{-3.0}\, M$
When $pH =5.0,\left[ H ^{+}\right]=10^{-5.0}\, M$
The ratio of hydrogen ion concentration $=\frac{10^{-3.0} \,M }{10^{-5.0} \,M }=100: 1$
The relative strength of acids is $100: 1$
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