4-A student carried out a titration to find the concentration of sulphuric acid. 25.0 cm3 of the sulphuric acid solution was neutralized by 34.0 cm3 of a potassium hydroxide solution of concentration 2.0 mol/dm3. The equation for the reaction is: 2KOH H2SO4  K2SO4 H2O Calculate the number of moles of potassium hydroxide used.