A volume of 20 ml of an aqueous solution of hydrated oxalic acid (H₂C₂O₄·xH₂O) containing 6.3 g per litre requires 40 ml of 0.05 M NaOH solution for complete neutralization. Which of the following sta

Question

A volume of 20 ml of an aqueous solution of hydrated oxalic acid (H₂C₂O₄·xH₂O) containing 6.3 g per litre requires 40 ml of 0.05 M NaOH solution for complete neutralization. Which of the following statement about the acid solution is/are correct?

TestHub · Accepted Answer

NaOH used = 40 x 0.05 = 2 mmol, so oxalic acid in 20 ml = 1 mmol (dibasic) → molarity = 1/20 = 0.05 M (so (c) is false). Mass in 20 ml = 6.3 x 0.02 = 0.126 g, hence hydrate molar mass = 0.126/0.001 = 126, giving 90 + 18x = 126, x = 2 (a true). Equivalent weight of anhydrous acid = 90/2 = 45, not 63 (b false). For oxidation, the acid has n = 2: 100 ml contains 5 mmol acid = 10 meq; KMnO₄ (n = 5): 40 ml x 0.05 M = 2 mmol = 10 meq - exactly matches, so (d) is true. Hence (a), (d).

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