pH of weak acid solutions (15.30) Determine the p H of an HF solution of each of

Question

pH of weak acid solutions (15.30)

Determine the pH of an HF solution of each of the following concentrations.

Part A

0.240 M

Express your answer to two decimal places.

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Part B

4.70×102 M

Express your answer to two decimal places.

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Part C

3.00×102 M

Express your answer to two decimal places.

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Chemistry 106 Summer 2016

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Homework Set #4

pH of weak acid solutions (15.30)

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Explanation / Answer

let me take the Ka value of HF from google

Ka of HF = 7.2 x 10–4

lets construct the ICE table

HF (aq) + H2O (l) <----> H3O+ + F-

I 0.24 0 0

C -x +x +x

E 0.24-x +x +x

Part A

ka = x2 / 0.24-x

7.2 x 10–4 = x2 / 0.24-x

x2 + x 7.2 * 10–4 - 1.728 x 10-4 = 0

solve the quadratic equation

x = 0.0128 = [H3O+]

pH = -log(H3O+) = -log (0.0128) = 1.9

same way do the remaining parts also

you have to change only intial concentration rest all same

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