MCQ
Which is the strongest acid ? ($pKa$ value is given in the bracket)
- ✓$HCOOH\,(3.77)$
- B${C_6}{H_5}COOH\,(4.22)$
- C$C{H_3}COOH\,(4.71)$
- D$C{H_3}C{H_2}COOH\,(4.88)$
✓
Answer
Correct option: A.
$HCOOH\,(3.77)$
a
The $\mathrm{pK}_{\mathrm{a}}$ value indicates the strength of an acid. A lower $\mathrm{pK}_{\mathrm{a}}$ value indicates a stronger acid i.e, the lower value indicates the acid more fully dissociates in water.
The $\mathrm{pK}_{\mathrm{a}}$ value indicates the strength of an acid. A lower $\mathrm{pK}_{\mathrm{a}}$ value indicates a stronger acid i.e, the lower value indicates the acid more fully dissociates in water.
: Formic acid with lower $\mathrm{pK}_{\mathrm{a}}$ value of 3.77 is the strongest acid.
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