When 10 mL of an aqueous solution of KMnO 4 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 KMnO 4 in grams per litre is _______ × 10 - 2 . (Nearest integer) [Atomic mass of K = 39 , Mn = 55 , O = 16 ]

Question

When 10 mL of an aqueous solution of KMnO 4 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 KMnO 4 in grams per litre is _______ × 10 - 2 . (Nearest integer) [Atomic mass of K = 39 , Mn = 55 , O = 16 ],

MARKS App · Accepted Answer

MnO 4 - vf = 5 + Fe 2 + ⟶ vf = 1 Mn 2 + + Fe 3 + Mili equ. of MnO 4 = - mili equ. of Fe 2 + 5 [ M × 10 ] = 1 [ 0 . 1 × 10 ] M = 0 . 1 5 = 0 . 02 mole Lit Strength of KMnO 4 = 0 . 02 × 158 gram Lit = 3 . 16 g / L = 316 × 10 - 2 g / L

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