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Question

What is pH of 50 ml 0.1 (M) NH4OH and 50 ml 0.05 (M) HCI?
pKb=4.73

A
9.27
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B
9.37
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C
8.37
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D
9.47
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Solution

The correct option is A 9.27
NH4OH + HCl NH4Cl+H2O
5 2.5 Milli moles before reaction
2.5 0 Milli moles before reaction
Concentration of both NH4Cl and NH3=2.5×102M
Applying henderson's equation-2
pOH=pKb+log[Salt][Base]=4.73
pH=144.73=9.27

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