A solution of 10.m koh was used to prepare 2.00L of 0.500 M KoH how many millilitres of the original KOH solution are needed

2 answers

150.ml
I don't think so. I assume that 10 m is really 10 M. M stands for molarity; m stands for molality.
mLKOH x 10 M = 2000 mL x 0.500 M
mL KOH = 2000 x 0.500/10 = ?