What is the pH of a .75M H2C6H6O6? Ka1=8e-5, ka2=1.6e-12. Please show all work in ICE...

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Question

What is the pH of a .75M H2C6H6O6? Ka1=8e-5, ka2=1.6e-12. Please show all work in ICE Tables. Thank you!

science chemistry

Answer 1

Answer #1

H2C6H6O6 --------------------> HC6H6O6^- + H⁺

I 0.75 0 0

C -x +x +x

E (0.75-x) x x

Ka1 = [HC6H6O6^-][H⁺]

8.0*10^-5 = x² / (0.75-x)

8.0*10^-5 * (0.75-x) = x²

solving for x = 0.0078 M

so [HC6H6O6^-] = [H⁺] = 0.0078 M

pH = -log[H⁺]

pH = -log[0.0078]

pH = 2.10

answer => pH = 2.1

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Answer 2

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