What is the molarity of a NaOH solution if 21.3 mL of the NaOH solution is neutralized by 10.4 mL of 6.10 M H3PO4?
3NaOH + H3PO4 ==> 3H2O + Na3PO4
mols H3PO4 = M x L = ?
mols NaOH = 3*mols NaOH from the coefficients in the balanced equation.
Then M NaOH = mols NaOH/L NaOH.