Chemistry

Problem

A tablet weighing 0.940 g was dissolved in dilute sulphuric acid made up to 250 cm³ with water. 25.0 cm³ of this solution was titrated with 0.00160 M K₂Cr₂O₇ requiring 32.5 cm³ of the K₂Cr₂O₇. Calculate the percentage by mass of Fe²⁺ in the tablet.

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