describe briefly how you would prepare a 0.2M solution of KOH in 250cm flask

Answer 1

0.2 M means 0.2 mol/L. You want 0.250 L; therefore, you want 0.2 x (0.250 L/1 L = ? mols.
Weight out ? mols, place in a 250 mL volumetric flask, add some distilled water, swirl until dissolved, then make the mark of the volumetric flask with distilled water, mix thoroughly, stopper. How many grams is ? mol KOH? That's grams = mols x molar mass.

Answer 2

c=n/v Answer n=m/mr
c=0.2 m=0.05.920
v=250mL/1000=0.25L m=46grms
n=?
n=cv
n=0.2.0.25=0.05mol