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April 23, 2014

Homework Help: Chemistry

Posted by Saira on Tuesday, August 11, 2009 at 8:17am.

Buffers- Common Ion effect

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Calculate the pH of a aqueous solution containing 0.15 M HNO2 and 0.20 M NaNO2 (aq). The Ka of nitrous acid is 4.0*10^-4.


HNO2 + H20 <--> NaNO2- + H30^+
Inital 0.15 0.20 X
Final 0.15 0.20


Ka= [H30+][NaNO2]/ [HNO2]
4.0*10^-4 = [H30+][0.20]/[0.15]
3.0*10^ -4 = H30+

pH= 3.52

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