Question

what mass of potassium hydroxide is required to produce 2.00L of a solution mthat has a pOH of 4.5?

Answer 1

pOH = 4.5. Convert to (OH^-) in units of molarity.
Then M = moles/L.
Substitute M and L, solve for moles.
Then moles = grams/molar mass. Solve for grams.