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2 L of 2 M Ag2SO4 is mixed with 4 L of 1 M NaCl. Assuming AgCl precipitates completely, find the sum of the molar concentrations of all ions remaining in the final solution.

1. 2 M
2. 4 M
3. 3 M
4. 2.5 M

Correct answer: 2 M

Solution

After AgCl precipitation, the leftover ions (4 mol Ag+, 4 mol SO4²-, 4 mol Na+) total 12 mol in 6 L, giving a summed concentration of 2 M.

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