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Two HCl solutions of concentration 3 M and 1 M are mixed in a volume ratio x: y to give a resultant concentration of 1.5 M. What is the resultant concentration when the same two solutions are mixed in the ratio y: x?

1. 2.50 M
2. 3.50 M
3. 1.30 M
4. 3.30 M

Correct answer: 2.50 M

Solution

The dilution equation gives x: y = 1: 3. Reversing to 3: 1 means the higher-concentration solution dominates, giving a molarity of 2.5 M.

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