When 10 mL of an aqueous solution of KMnO4 was titrated in acidic medium, equal volume of 0.1 M of an aqueous solution of ferrous sulphate was required for complete discharge of colour. The strength of KMnO4 is grams per litre is________× 10-2. (Nearest integer)
[Atomic mass of K = 39, Mn = 55, O = 16]
When 10 mL of an aqueous solution of KMnO4 was titrated in acidic medium, equal volume of 0.1 M of an aqueous solution of ferrous sulphate was required for complete discharge of colour. The strength of KMnO4 is grams per litre is________× 10-2. (Nearest integer)
[Atomic mass of K = 39, Mn = 55, O = 16]
Asked by Shiksha User
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1 Answer
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Let molarity of KMnO4 = x
n = 5 n = 1 Ferric sulphate
equivalent of KMnO4 = equivalent of FeSO4
5 × x × 10 = 1 × 0.1 × 10
x = 0.02 M
Strength = (0.02 × 158) = 3.16g/L
= 316 × 10-2 g/L
Ans. = 316
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