Question

How many grams of KOH are needed to prepare 250. Millimeters of a 2.00 solution of KOH

Answer 1

Use the concentration given to get the answer and the molar mass of the substance. 

250 ml (1 Liter/ 1000 ml) (2.00 mol KOH/ 1 liter) ( 56.1 grams/ 1 mole KOH)= 28.1 grams

Answer 2

250 ml (1 Liter/ 1000 ml) (2.00 mol KOH/ 1 liter) ( 56.1 grams/ 1 mole KOH)= 28.1 grams