# A buffer solution has equal volumes of 0.2 M NH_(4)OH and 0.02 M NH_(4)Cl. The pK_(b) of the base is 5. The pH is

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A buffer solution has equal volumes of 0.2 M NH_(4)OH and 0.02 M NH_(4)Cl. The pK_(b) of the base is 5. The pH is
A. 10
B. 9
C. 4
D. 7

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pOH = pK_(b) + log.(["salt"])/(["base"])
= 5 + log.(0.02)/(0.2) = 5 + log.(1)/(10) = 5 + (-1) = 4
pH = 14 - pOH = 14 - 4 = 10.