Question

What will be the concentration of a solution when 20g of potassium nitrate is dissolved in water to a final value of 500ml?

Answer 1

We will assume you want the concentration in molars.

Recall,

`"M" = "mol"/"L"`

Hence,

`(20"g" * (KNO_3)/(101.1"g"))/(0.5"L") approx 0.4"M"`

is the concentration of that weakly basic solution.