Precipitation Reaction: Mass of Ions Before Precipitation
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A solution contains Cr3+ ion and Mg2+ ion. The addition of 1.00 L of 1.55 M NaF solution is required to cause the complete precipitation of these ions as CrF3 (s)and MgF2(s). The total mass of the precipitate is 50.2 g. Find the mass of the Cr3+ in the original solution.
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Solution Summary
This solution shows step-by-step stoichiometric calculations and brief explanations to determine the mass of the chromium ion in the original solution.
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1L NaF 1.55M nNaF = 1.55 mol
Cr3+ + 3NaF 3Na+ + CrF3 (1)
a 3a a
Mg2+ + 2NaF 2Na+ + MgF2 (2)
b 2b b
Let's say a is some mol amount ...
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