How many milliliters of 0.125 M H2SO4 are needed to neutralize 0.250 g of NaOH?

Question

How many milliliters of 0.125  M  H2SO4 are needed to neutralize 0.250 g of NaOH ?
Express the volume in milliliters to three significant digits.

Answer 1

First you need balanced equation : 2 NaOH + H2SO4 → Na2SO4 + 2H2O

 

0.250 g NaOH x 1 mol/39.9g = 0.0063 mol - from molar mass of NaOH

 

0.0063 mol x 1mol H2SO$/2 mol NaOH = 0.00315 mol H2SO4 - number of moles H2SO4 needed from balanced equation

 

0.00315 mol H2SO4 x 1000mL/ 0.125 mol = 25.2 mL - using molarity of H2SO4 given

 

Answer: 25.2 mL H2SO4