Asked Jan 23, 2020
Find the pH of a 0.056 M propionic acid solution (Ka = 1.4 x 10-5).

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Find the pH of a 0.056 M propionic acid solution (Ka = 1.4 x 10-5). %3D


Expert Answer

Step 1

The reaction of propionic acid with water is written as follows:

CH3CH2COOH(aq) + H2O (l)→ CH3CH2COO-(aq) + H3O+(aq)


The ICE table for the above reaction is shown below.

Chemistry homework question answer, step 1, image 1
Step 2


Write the acid dissociation constant for the above reaction as written in equation (1).

Now, substitute 1.4×10-5 for Ka, x for CH3CH2COO-and H3O+ and 0.056 - x for CH3CH2COOH as shown in equation  (2).

Chemistry homework question answer, step 2, image 1
Step 3

Neglecting x in the denominator as shown in equation  (3),



Chemistry homework question answer, step 3, image 1

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