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

Part A

Determine the [H3O+] of a 0.250M solution of formic acid.

Express your answer using two significant figures.

[H3O+] = ???

Part B

Determine pH of this solution of formic acid.

Express your answer to two decimal places.

pH=???

Solutions

Expert Solution

Part A:

HCOOH < --------------> COO-(aq) + H3O+(aq)

I 0.250 0 0

C -x +x +x

E 0.250-x +x +x

Ka = [H3O+][COO-] / [HCOOH] = 1.8 x 10^-4

1.8 x 10^-4 = x^2 / (0.250-x)

x^2 + (1.8 x 10^-4)x - (4.5 x 10^-5) = 0

Solving the quadratic equation,

x = 0.0066

Thus, [H3O+] = x = 0.0066 M

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Part B:

pH = -log[H3O+]

pH = -log(0.0066)

pH = 2.18

Given, 0.250 M of HCOOH (formic acid)

[H3O+]

queen_honey_blossom answered 2 hours ago

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