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When a large excess of AgNO3 is added to 100 mL of a 0.01 M solution of dichlorotetraaquachromium(III) chloride, how many moles of AgCl will be formed as precipitate?

1. 0.002
2. 0.003
3. 0.01
4. 0.001

Correct answer: 0.001

Solution

In [CrCl2(H2O)4]Cl only the one chloride outside the coordination sphere is precipitated. Moles of complex = 0.01 M x 0.100 L = 0.001 mol, so 0.001 mol AgCl forms.

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