Published by:
CGP EDU Academic Team
Published on: August 14, 2026
0.1 mole of CH 3 NH 2 (K b = 5 × 10 –4 ) is mixed with 0.08 mole of HCl and diluted to one litre. What will be the H + concentration in the solution ?
Text Solution
Verified by ExpertsThe correct answer is:
B
CH 3 NH 2 + HCI 
CH 3 
+ CI –
Initial moles 0.1 0.08
moles after reaction 0.02 0 0.08 mole (in 1 L solution) ⇒ buffer
K b = 
or, 5 × 10 –4 = 
or, [OH – ] = 
× 10 –4 .
[H + ] = 
or, [H + ] = 
= 8 × 10 – 11 M.
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