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A solution is 8% (w/w) and also 10% (w/v) in the same solute. Calculate the density of the solution in g/mL.

1. 1.25
2. 0.80
3. 1.00
4. 1.10

Correct answer: 1.25

Solution

10% w/v means 10 g solute per 100 mL; 8% w/w means 10 g solute is in 10/0.08 = 125 g solution, so 100 mL weighs 125 g, density 1.25 g/mL.

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