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Question

A solution contains 0.405 g of oxalic acid, H2C2O4.2H2O, in 500 mL. What is the molarity of this solution? What is the normality of this solution with respect to the following reaction:
H2C2O4 (aq) + 2NaOH (aq) --> Na2C2O4 (aq) + 2H2O (l)

Answer 1

The molar mass of H2C2O4.2H2O is: 126.07 g/mol.
Hence 0.405g oxalic acid in 500 mL <==> 0.00321mol oxalic acid in 500 mL <==> 0.00642M
The given reaction is acid-base reaction, hence the normality is refering to H+ concentration.
normality of H+ is: (0.00642)*2*1.0079 = 0.0130