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If the concentration of [ N H 4 + ] in a solution having 0.02 M N H 3 and 0.005 M C a O H 2 is a × 10 - 6 M , determine a . [ k b N H 3 = 1.8 × 10 - 5 ]

Correct answer

36

Step-by-step solution

N H 4 O H ⇋ N H 4 + + O H - k b = N H 4 + O H - N H 4 O H ⇒ 1.8 × 10 - 5 = N H 4 + 0.01 0.02 As O H - will mainly come from C a O H 2 only ⇒ N H 4 + = 36 × 10 - 6 = a × 10 - 6 ⇒ a = 36

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