Answer: The molarity of the initial concentrated solution is 0.450 M
Explanation:
According to the dilution law,

where,
= Molarity of concentrated KOH solution = ?
= volume of concentrated KOH solution = 175 ml
= concentration of diluted KOH solution= 0.315 M
= volume of diluted KOH solution= 250 ml
Putting in the values, we get:


Thus the molarity of the initial concentrated solution is 0.450 M