Chemistry
posted by Helena .
how many grams of solid KOH is needed to neutralize 1.00 L of 0.250 M HNO3 solution?

Write the equation and balance it.
How many moles HNO3 do you have? That is M x L = ??
How many moles KOH are needed? From the equation you know it is the number as moles HNO3.
Then moles KOH = grams KOH/molar mass KOH. Solve for grams.