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15 mL of aqueous solution of Fe²⁺ in acidic medium completely reacted with 20 mL of 0.03M aqueous Cr₂O₇²⁻. The molarity of the Fe²⁺ solution is ____ × 10⁻² M.
n(eq) Fe²⁺ = n(eq) Cr₂O₇²⁻. (15 × M)/1000 × 1 = (20 × 0.03)/1000 × 6. M = 0.24 M = 24 × 10⁻² M.
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