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1 M NH4OH and 1 M HCl are mixed to make total volume of 300 mL. If pH of the mixture is 9.26 and pKa (NH4+) = 9.26 then volume ratio of NH4OH and HCl will be:

(a) 1 : 1 

(b) 1 : 2

(c) 2 : 1 

(d) 3 : 1

1 Answer

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Best answer

Correct option: (c) 2 : 1

Explanation: 

HCl will convert equivalent amount of NH4OH into NH4Cl and thus resultant mixture is a buffer.

Let HCl = x mL NH4Cl formed = x milli mol

NH4OH = (300 – x) mL, NH4OH left = (300 – 2x) milli mol

x = 100 mL = volume of HCl

200 mL = volume of NH4OH

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