Question

A solution has a concentration of 0.3mol/dm of sodium hydroxide. What volume of the solution must be measured out to obtain 0.02 mol of sodium hydroxide?

a)0.67dm3
b)0.15dm3
c)0.07dm3
d) 0.06dm3

Answer 1

To obtain 0.02 mol of sodium hydroxide from a solution with a concentration of 0.3 mol/dm³, a volume of 0.07dm³ must be measured out.

Step-by-step explanation:

To determine the volume of the solution needed, we can use the formula:

Volume = Moles / Concentration

In this case, we want to obtain 0.02 mol of sodium hydroxide, and the concentration of the solution is 0.3 mol/dm³.

Plugging in these values, we get:

Volume = 0.02 mol / 0.3 mol/dm³ = 0.067 dm³

Therefore, the correct answer is 0.07dm³ (c) as the volume of the solution that must be measured out to obtain 0.02 mol of sodium hydroxide.