Calculate the pH of the resulting solution obtained by mixing 60 mL 0.1 M HCl and 40 mL 0.1 M NaOH.

Step-by-step solution

Millimoles of HCl = 60 0.1 = 6 mmol Millimoles of NaOH = 40 0.1 = 4 mmol Since HCl and NaOH react in a 1:1 ratio, the remaining millimoles of HCl = 6 - 4 = 2 mmol . Total volume of the mixture = 60 + 40 = 100 mL . Concentration of H ⁺ ions in the resulting solution is given by: [ H ⁺] = 2 mmol 100 mL = 0.02 M pH = - [ H ⁺] = - (2 10⁻²) pH = 2 - 2 = 2 - 0.301 = 1.699 Answer: 1.699