Part A Determine the [H3O+] of a 0.250 M solution of formic acid. Express your answer...

Part A Determine the [H3O+] of a 0.250 M solution of formic acid. Express your answer using two significant figures.

Part B

Determine pH of this solution of formic acid.

Express your answer to two decimal places.

Expert Solution

HCOOH + H2O ----------> HCOO^- + H3O⁺

I 0.25 0 0

C -x +x +x

E 0.25-x +x +x

Ka = [HCOO-][H3O+]/[HCOOH]

1.77*10^-4 = x*x/0.25-x

1.77*10^-4 *(0.25-x) = x^2

x = 0.00656

[H3O+] = x = 0.00656M

PH = -log[H3O+]

= -log0.00656

= 2.183

queen_honey_blossom answered 1 year ago

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