The equivalent weight of oxalic acid in C₂H₂O₄.2H₂O is
45
63
90
126
Answer is Wrong!
Answer is Right!
This question was previously asked in
UPSC NDA-1 – 2019
– The molar mass of 2H₂O = 2 × (2 × 1.01 + 16.00) = 2 × 18.02 = 36.04 g/mol.
– The molar mass of C₂H₂O₄.2H₂O = 90.04 + 36.04 = 126.08 g/mol.
– Oxalic acid is a diprotic acid, meaning it has 2 acidic hydrogens.
– Equivalent weight = Molar mass / number of acidic hydrogens = 126.08 g/mol / 2 = 63.04 g/equivalent.
– Among the options, 63 is the closest value.