Water was added to 175 mL of a KOH solution until the volume was 250 mL and the molarity was 0.315 M. What was the molarity of the initial concentrated solution?

 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