15 mL of aqueous solution of Fe2+ in acidic medium completely reacted with 20 ml of 0.03 M aqueous Cr2O72-. The molarity of the Fe2+ solution is _______ ×10-2 M (Round off to the nearest integer).
15 mL of aqueous solution of Fe2+ in acidic medium completely reacted with 20 ml of 0.03 M aqueous Cr2O72-. The molarity of the Fe2+ solution is _______ ×10-2 M (Round off to the nearest integer).
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1 Answer
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Cr? O? ²? + Fe²? - (H? )-> Cr³? + Fe³?
(n=6) (n=1)
Meq Cr? O? ²? = Meq Fe²?
20 × 0.03 × 6 = 15 × M × 1
M = (20 × 0.03 × 6) / 15 = 0.24 = 24 × 10? ²
Ans = 24
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