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?

Question

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? (A) H2SO3 (B) HNO2 (C) CH3COOH (D) HCN

Tardigrade Admin · Accepted Answer

K a ( HCN )=4 × 10-10 HCN leftharpoons H ++ CN - Weaker the acid, stronger the conjugate base.

Q. $K_{u}$ values for acids $H_{2} S O_{3}, H N O_{2}, C H_{3} COO H$ and $H CN$ are respectively $1.3 \times 1 0^{- 2}, 4 \times 1 0^{- 4}, 1.8 \times 1 0^{- 5}$ and $4 \times 1 0^{- 10}$ , which of the above acids produces stronger conjugate base in aqueous solution?

$H_{2} S O_{3}$

$H N O_{2}$

$C H_{3} COO H$

$H CN$

$K_{a} (H CN) = 4 \times 1 0^{- 10}$
$H CN ⇌ H^{+} + C N^{-}$
Weaker the acid, stronger the conjugate base.

Q. Ku​ values for acids H2​SO3​,HNO2​,CH3​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?

H2​SO3​

HNO2​

CH3​COOH

HCN