How much 0.150 M sodium hydroxide would be required to just neutralize 15 ml of 0.175 M hydrochloric acid?

Answer 1

moles HCl = M x L = ??
moles HCl = moles NaOH because the reaction is 1 mole to 1 mole. Write the equation.
Then M NaOH = moles/L.
Solve for L (and convert to mL if desired.)