First slide

Acidic buffer

Question

Which of the following mixture acts as buffer solution ?

Easy

A

100 ml 0.2 N CH₃COOH + 100 ml of 0.1 M NaOH
B

100 ml 0.1 M CH₃COOH + 100 ml 0.2M NaOH
C

100 ml 0.2M CH₃COOH + 100 ml 0.2 M NaOH
D

None of the above acts as buffer solution due to the presence of strong base, NaOH

Solution

Millimoles of CH₃COOH = 100 $\times$ 0.2 = 20
Millimoles of NaOH = 100 $\times$ 0.1 = 10
$C{H_3}COOH + NaOH\xrightarrow{{}}C{H_3}COONa\;+\;{H_2}O.$

t = 0 20 10 0 0

t = $\infty$ 20-10 10-10 10 10

=10 0 0 0

Finally the system contains.
1) CH₃COOH which is a weak acid.
2) CH₃COONa which is the salt of CH₃COOH.

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