How many litres of water must be added to 1 L of an aqueous solution of HCl with a pH of 1 to create an aqueous solution with pH of 2 ?

pH = 1∴    H+ = 10-1 = 0.1 MpH = 2∴    H+ = 10-2 = 0.01 MFor dilution of HCl,M1V1 = M2V20.1 × 1 = 0.01 × V2V2 = 10 LVolume of water required = 10-1 = 9 lits