Gen-Chem Problem

[Dr.9999]

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You have .2M of acetic acid and .2M of a weak base. What is the PH of the (H+) concentration? Ka= 2.0 x 10-5.

 

[Papasmurf1234]

Ka = [H+][Conjugate Base]/[acid]

Ka = 2.0x10-5 = [H+][0.2]/[0.2] = [H+]=2.0x10-5

pH = -log[H+] = -log[2.0x10-5]

I don't have a calculator with me but i'm sure you can figure it out.