If 500 mL of a 5 M solution is diluted to 1500 mL, what is the molarity of the resulting solution?

Model Answer & Options

Source: Extra Practice

1.5 M

1.66 M

2.5 M

0.5 M

Explanation

Using the dilution formula M1V1 = M2V2: (5 M) × (500 mL) = M2 × (1500 mL). M2 = (5 × 500) / 1500 = 2500 / 1500 = 1.666... M. Option 1.5 M is a rounding error, 2.5 M would occur if volume doubled, and 0.5 M is a calculation error.

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