Question

What corncentration will a 100mL, 0.5 M aqueous solution become if you increase the
volume to 300mL by only adding solvent?
A 0.17M
B 1.5M
C 0.5M
D 0.33M

Answer 1

Answer:

A. 0.17M

Explanation:

The given the volume and concentration of a stock solution, V1 (100ml) and C1 (0.5M), and the volume of the resultant diluted solution, V2 (300ml). We need to find the concentration of the diluted solution, C2. We thus rearrange the dilution equation in order to isolate C2

$C1V1 = C2V2\\C2 = \frac{C1V1}{V3} = \frac{0.5*100}{300} = 0.1666M$