MEDIUMMCQ SINGLEIChO (Chemistry Olympiad)Physical ChemistryIonic equilibriumBuffer Solutions

Solution of 0.1 N NH4OH and 0.1 N NH4Cl has pH 9.25. The pKb of NH4OH is

A.9.25

B.4.75✓ Correct

C.3.75

D.8.25

Explanation

We know that, it is a basic buffer. + - 4 4 + 4 4 N 5 H OH NH OH and, NH Cl C Giv N en H H l ,p 9.2 b b and,pOH 14 9.25 4.75 pOH pK log[salt] /[base] 4.75 pK log1 (if [salt]=[base]) pK 4.75 b

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