Equilibrium

Equilibrium

Question

Consider the reaction:
Cl2(aq) + H2S(aq) → S (s) + 2H+ (aq) + 2Cl- (aq)
The rate equation for this reaction is
I. Cl2 + H2S → H+ +Cl- + Cl+ +HS-
II. H2S ⇌ H+ + HS- (fast equilibrium)
Cl2 + HS- → 2Cl- + H+ + S (slow)

  • II only

  • Both (I) and (II)

  • Neither (I) nor (II)

  • (I) only

Answer

D.

(I) only

For (A)
rate = K[Cl2] [H2S]
For (B)
rate = K[Cl2] [HS-] … (i)
putting space in space equation space left parenthesis straight i right parenthesis
rate space equals space straight K left square bracket Cl subscript 2 right square bracket space Keq space fraction numerator left square bracket straight H subscript 2 straight S right square bracket over denominator left square bracket straight H to the power of plus right square bracket end fraction

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