Question

Calculate the resultant pH of a solution when 20ml of 0.1 N NaOH is mixed with 20 ml of 0.05 M Ca(OH)2

Answer 1

Here is your answer.

Molarity of OH` ions generated by 0.05 M Ca (OH)2 = 0.05 × 2 = 0.10 M

Molarity of OH` ions generated by 0.10 M of NaOH = 0.10 M

So Molarity of OH’ ions in the mixture will remain same or 0.10 M or 1 × 10 ^-1

Molarity of H3O+ ions in mixture = 1 × 10 -14 / 1 × 10^-1

= 1 × 10^-13

pH = 13