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What volume (in mL) of 0.8 M AlCl3 must be combined with 50 mL of 0.2 M CaCl2 so that the resulting solution has a chloride ion concentration of 0.6 M?

1. 5.0
2. 5.56
3. 10.0
4. 12.5

Correct answer: 5.56

Solution

Setting up the chloride balance, (2.4 V + 0.02)/(V + 0.05) = 0.6 gives V ~ 0.00556 L = 5.56 mL.

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