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Answer to Question #58355 in Inorganic Chemistry for Afnaan Qurreshi

Question #58355
A weak acid HA has Ka=10^-6. What would be the molar ratio of this acid and its salt with strong base so that the pH of the buffer solution is 5?
Expert's answer
The formula of the pH of buffer solution:
pH = pKa(acid)+lg(C(salt)/C(acid))
5 = -Lg(10-6) + lg(C(salt)/C(acid))
5 = 6 + lg(C(salt)/C(acid))
-1 = lg(C(salt)/C(acid))
10-1 = C(salt)/C(acid)
0.1 = C(salt)/C(acid)
C(acid)/ C(salt) = 10

Answer:
The molar ratio of the acid and its salt with strong base is 10.

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