20 mL of 0.1 M NH OH is mixed with 40 mL of 0.05 M HCl. The pH of the mixture is nearest to: (Given: K (NH OH) = 1 × 10 , log 2 = 0.30, log 3 = 0.48, log 5 = 0.69, log 7 = 0.84, log 11 =1.04) 4 b 4 –5

Question

20 mL of 0.1 M NH OH is mixed with 40 mL of 0.05 M HCl. The pH of the mixture is nearest to: (Given: K (NH OH) = 1 × 10 , log 2 = 0.30, log 3 = 0.48, log 5 = 0.69, log 7 = 0.84, log 11 =1.04) 4 b 4 –5 4 4 2 w b –5

(A) 3.2
(B) 4.2
(C) 5.2
(D) 6.2

Prashant Kotian · Accepted Answer

Correct answer: C) 5.2. NH OH + HCl → NH Cl + H O 2 moles, 2 moles 0 0 2 moles pH = pK – pK – logC = – × (–log (10 )) – log = 7 – 2.5 + = 7 – 2.5 + 0.74 = 5.24

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