Oxalic acid , HOOCCOOH, is a diprotic acid with Ka1= 0.056 and Ka2=1.5x10-4. Determine the equilibrium...

Oxalic acid , HOOCCOOH, is a diprotic acid with Ka1= 0.056 and Ka2=1.5x10-4. Determine the equilibrium [HOOCCOOH] in a solution with an initial concentration of 0.116 M oxalic acid

. HOOCCOOH = HOOCCOO- + H+

HOOCCOO- = -OOCCOO- + H+

Expert Solution

HOOCCOOH ------------>HOOCCOO- + H+

I 0.116 0 0

C -x +x +x

E 0.116-x +x +x

Ka1 = [HOOCCOO-][H+]/ [HOOCCOOH]

0.056 = x*x/(0.116-x)

0.056*(0.116-x) = x^2

x = 0.057

[HOOCCOOH] = 0.116-x = 0.116-0.057 = 0.059 M

queen_honey_blossom answered 2 years ago

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