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Salt of Strong Acid and Weak Base

5.00 mL of 0....

Question

$5.00 mL$ of $0.10 M$ oxalic acid solution taken in a conical flask is titrated against $N a O H$ from a burette using phenolphthalein indicator. The volume of $N a O H$ required for the appearance of permanent faint pink color is tabulated below for five experiments. What is the concentration, in molarity, of the $N a O H$ solution?

Exp. No.

Vol. of NaOH (mL)

1

12.5

2

10.5

3

9.0

4

9.0

5

9.0

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Solution

$H_{2} C_{2} O_{4} + 2 N a O H 9 mL \to N a_{2} C_{2} O_{4} + 2 H_{2} O$
By equivalence concept,
$Milliequivalent of H_{2} C_{2} O_{4} = Milliequivalent of N a O H$
$5 \times 0.1 \times 2 = 9 \times x x = \frac{1}{9} M x = 0.11 M$

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Salt of Strong Acid and Weak Base

Standard XII Chemistry

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