20 mL of 0.1 M NH4OH is mixed with 40 mL of 0.05 M HCl. The pH of the mixture is nearest to

20 mL of 0.1 M NH4OH is mixed with 40 mL of 0.05 M HCl. The pH of the mixture is nearest to: (GivenKb (NH4OH) = 1x10−5 ,log2 = 0.30,log3 = 0.48,log5 = 0.69,log7 = 0.84,log11 = 1.04)

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