A K M n O 4 solution can be standardised by titration against A s 2 O 3 ( s ) . A 0.1156 g sample of A s 2 O 3 requires 27.08 mL of the K M n O 4 (aq) for its titration. What is the molarity of the K M n O 4 ( a q ) [As = 75].

Question

A K M n O 4 solution can be standardised by titration against A s 2 O 3 ( s ) . A 0.1156 g sample of A s 2 O 3 requires 27.08 mL of the K M n O 4 (aq) for its titration. What is the molarity of the K M n O 4 ( a q ) [As = 75]., 0.0172 M, 1.0172 M, 0.172 M, 0.9172 M

MARKS App · Accepted Answer

Meq. of A s 2 O 3 = Meq of KMnO 4 As 2 3 + → 2 As 5 + + 4 e − 0.1156 198 / 4 × 1000 = M × 5 × 27.08 Mn 7 + + 5 e − → Mn 2 + ∴ M = 0.0172 ∴ M M n O 4 - = 0.0172 M

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