Problem: A weak acid was 13% ionized. What would be the pH of a 0.50 M solution and what is the pKa of the acid?A. pH = 1.2; pKa = 2.0B. pH = 4.3; pKa = 3.9C. pH = 2.5; pKa = 3.2D. pH = 4.8; pKa = 6.5E. pH = 11.8; pKa = 11.8

FREE Expert Solution

We’re being asked to determine the pH of a 0.50 M weak acid that is 13 % ionized.


Recall that the percent ionization is given by:


% ionization=[H3O+][HA]initial×100


Also recall that pH is given by:


pH=-log[H3O+]


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Problem Details

A weak acid was 13% ionized. What would be the pH of a 0.50 M solution and what is the pKa of the acid?

A. pH = 1.2; pKa = 2.0

B. pH = 4.3; pKa = 3.9

C. pH = 2.5; pKa = 3.2

D. pH = 4.8; pKa = 6.5

E. pH = 11.8; pKa = 11.8

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