QJEEM21Che292: JEE Main 2021 Chemistry - Class 11 JEEM21Che292 Solution: The OH concentration in a mixture of 5.0 mL of 0.0504 M NH 4 Cl …

Question

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The OH^$-$ concentration in a mixture of 5.0 mL of 0.0504 M NH₄Cl and 2 mL of 0.0210 M NH₃ solution is x

\times

10^{$-$ 6} M. The value of x is ___________. (Nearest integer)

[Given K_w = 1

\times

10^{$-$ 14} and K_b = 1.8

\times

10^{$-$ 5}]

Accepted Answer

\left[ {NH_4^ + } \right]

= 0.0504 & [NH₃] = 0.0210

So,

{K_b} = {{[NH_4^ + ][H{O^ - }]} \over {[N{H_3}]}}

[H{O^ - }] = {{{K_b} \times [N{H_3}]} \over {[NH_4^ + ]}} = 1.8 \times {10^{ - 5}} \times {2 \over 5} \times {{210} \over {504}} = 3 \times {10^{ - 6}}

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