10:35 minutes
Problem 116
Textbook Question

A solution contains Cr3 + ions and Mg2 + ions. The addition of 1.00 L of 1.51 M NaF solution causes the complete precipitation of these ions as CrF3(s) and MgF2(s). The total mass of the precipitate is 49.6 g. Find the mass of Cr3 + in the original solution.

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