How many mililiters of 0.250 M sodium hydroxide are required to react completely with 10.0 mL of 0.50 M sulfuric acid solution?

Answer 1

Write the balanced equation:

2NaOH + H2SO4 ==> Na2SO4 + H2O .. balanced equation

Note the mole ratio of 2 : 1 for NaOH : H2SO4

moles H2SO4 present = 10.0 ml x 1 L / 1000 ml x 0.50 mol / L = 0.0050 mols

mols NaOH needed = 0.0050 mols H2SO4 x 2 mols NaOH / 1 mol H2SO4 = 0.010 mols

Volume (mls) NaOH needed = 0.010 mols NaOH x 1 L / 0.250 mols x 1000 mls / L = 40 mls NaOH