Find the pH value of the mixture containing 50 cc M HCl and 30 cc M NaOH solution, assuming both to be completely ionised.

Step-by-step solution

Total volume after mixing =50+30=80 cc Moles of HCl after mixing = 50 80 M Moles of NaOH after mixing = 30 80 M Remaining number of moles of HCl after mixing aligned & = 50 80 - 30 80 =0.25 M [ H ⁺ ] & =0.25=2.5 10⁻¹ pH & =- [2.5 10⁻¹ ] & =1-0.3979=0.6021 aligned