When 10 mL of an aqueous solution of 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 in

Question

When 10 mL of an aqueous solution of  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  in grams per litre is . (Nearest integer)

[Atomic mass of , , ]

Canvas Classes · Accepted Answer

Step 1 — Balanced reaction in acidic medium:

Or using n-factor method:
- : Mn goes , n-factor = 5
- : Fe goes , n-factor = 1

Step 2 — Equivalents must be equal:

Step 3 — Moles of :

Step 4 — Moles of :

Step 5 — Molarity of :

Step 6 — Strength in g/L:

Answer: 316

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