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JulijaS [17]
3 years ago
10

A 20.0 mL of 0.27 M solution of the salt NaA has a pH of 8.70.

Chemistry
1 answer:
chubhunter [2.5K]3 years ago
8 0

Answer:

a) 3.969

b) 3.487

Explanation:

Given data:

m =  0.27 M

pH = 8.7

<u>a) Calculate PKa of acid HA</u>

pH value = 1/2 ( Pkw + Pka + log C )

    8.7 * 2 = 14 + log C + Pka

        17.4 = 14 + log ( 0.27 ) + Pka

∴Pka = 17.4 - 14.5686 = 3.9686 ≈ 3.969

<u>b) Calculate the pH of solution </u>

pH = pKa + log ( salt / acid )

     = 3.9686 + log ( 0.1 / 0.3 )

     = 3.487

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