Volume of 0.50 M NaOH solution required to react with 40.0 mL of 0.05 M H2SO4 solution is :
30.0 mL of the given HCl solution requires 20.0 mL of 0.1 M sodium carbonate solution for complete neutralisation. What is the volume of this HCl solution required to neutralise 30.0 mL of 0.2 M NaOH solution?