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  4. An aqueous solution of 6.3 g oxalic acid dehydrate is made upto 250 mL. The volume of 0.1N NaOH required to completely neutralize 10 ml. of this solution is

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Q. An aqueous solution of $6.3\, g$ oxalic acid dehydrate is made upto $250\, mL$. The volume of $0.1N\, NaOH$ required to completely neutralize $10 \,ml$. of this solution is

IIT JEEIIT JEE 2001Some Basic Concepts of Chemistry

Solution:

Oxalic acid dihydrate $H_2C_2O_4 \cdot 2H_2O:mw=126$
It is a dibasic acid, hence equivalent weight = 63
$\Rightarrow $ Normality $=\frac{6.3}{63}\times \frac{1000}{250}=0.4\, N$
$\Rightarrow N_1V_1 =N_2V_2$
$\Rightarrow 0.1 \times V_1 =0.4 \times \, 10$
Hence, $ V_1 =40 \,mL$