First slide

Acidic buffer

Question

Statement I : 0.1M NaCN + 0.05M HCl solution on mixing in equal volume forms a buffer solution
Statement II : The solution after mixing contains a weak acid and its conjugate base and thus acts as buffer

Moderate

A

Statement I and II are correct
B

Statement I is correct and Statement II is incorrect
C

Statement - I is incorrect and Statement II is correct
D

Both statement - I and statement - II are False

Solution

On mixing the following reaction occurs.
NaCN + HCl → HCN + NaCl
t=0 0.1 x v 0.05 x V 0
$t = t_{\infty}$ 0.1V - 0.05V = 0.05V 0.1V - 0.05V = 0 0.05 v
After reaction solution is mixture of weak acid and its salt with strong base, thus acts as buffer solution

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