1. Tardigrade
  2. Question
  3. Chemistry
  4. K u values for acids H 2 SO 3, HNO 2, CH 3 COOH and HCN are respectively 1.3 × 10-2, 4 × 10-4, 1.8 × 10-5 and 4 × 10-10, which of the above acids produces stronger conjugate base in aqueous solution?

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Q. $K _{ u }$ values for acids $H _{2} SO _{3}, HNO _{2}, CH _{3} COOH$ and $HCN$ are respectively $1.3 \times 10^{-2}, 4 \times 10^{-4}, 1.8 \times 10^{-5}$ and $4 \times 10^{-10}$, which of the above acids produces stronger conjugate base in aqueous solution?

KCETKCET 2021Equilibrium

Solution:

$K _{ a }( HCN )=4 \times 10^{-10} $
$HCN \rightleftharpoons H ^{+}+ CN ^{-}$
Weaker the acid, stronger the conjugate base.