Verified Solution • 2025–26 Session moderate

QAIPMT-2009-Ch-2097: NEET 2009 Chemistry - Class 11 AIPMT-2009-Ch-2097 Solution: The dissociation constants for acetic acid and HCN at \(25^ C\) …

The dissociation constants for acetic acid and HCN at 25∘C25^\circ C are 1.5×10−51.5\times10^{-5} and 4.5×10−104.5\times10^{-10} respectively. The equilibrium constant for the equilibrium CN−+CH3COOH⇌HCN+CH3COO−CN^-+CH_3COOH\rightleftharpoons HCN+CH_3COO^- would be

Multiple Choice Options

  • A 3.0×1053.0\times10^5
  • B 3.0×10−43.0\times10^{-4}
  • C 3.0×1043.0\times10^4
  • D 3.0×10−53.0\times10^{-5}

Step-by-Step Verified Solution

CH 3 COOH _ CH 3 COO � + H + ,   K 1 = 1.5 _ 10 _ 5 _ K 1 = [ C H 3 C O O _ ] [ H + ] [ C H 3 C O O H ] = 1.5 _ 10 _ 5 HCN _ CN � + H + ,     K 2 = 4.5 _ 10 �10 K 2 = [ C N _ ] [ H + ] [ H C N ] = 4.5 _ 10 �10 CN _ + CH 3 COOH _ HCN + CH 3 COO _ K = [ H C N ] [ C H 3 C O O _ ] [ C N _ ] [ C H 3 C O O H ] _ K = K 1 K 2 = 1.5 _ 10 _ 5 4.5 _ 10 _ 10 = 3.33 _ 10 4 _ 3.0 _ 10 4

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