Question

Oxalic acid can donate two protons to water in successive reactions: (1) H2C2O4(aq)+H2O(l)⇌H3O+(aq)+HC2O4-(aq) (2) HC2O4-(aq)+H2O(l)⇌H3O+(aq)+C2O42-(aq) If...

Oxalic acid can donate two protons to water in successive reactions:

(1) H2C2O4(aq)+H2O(l)⇌H3O+(aq)+HC2O4-(aq)

(2) HC2O4-(aq)+H2O(l)⇌H3O+(aq)+C2O42-(aq)


If Kc1 = 5.9 × 10-2 andKc2 = 6.4 × 10-5 at 25°C, what is the value of Kc for reaction (3)?

(3) H2C2O4(aq)+2H2O(l)⇌2H3O+(aq)+C2O42-(aq)

A) 9.2 × 102

B) 1.1 × 10-3

C) 5.9 × 10-2

D) 3.8 × 10-6

Why is C not the right answer? Does Hess's Law not apply in this problem?

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