Question

Calculate the pH of the acid solution after adding 218.8 mL of the KOH solution.

a) 2.58
b) 3.12
c) 4.06
d) 5.20

Answer 1

To calculate the pH change in an acetic acid solution after adding KOH, the reaction between the acid and base must be considered, and more information on the concentrations is needed.

Step-by-step explanation:

To calculate the pH of an acid solution after the addition of KOH solution, one must consider the neutralization reaction between the acid and the base. For acetic acid (CH3CO2H), which has a pKa of 4.74 (Ka = 1.8 × 10−5), the reaction with KOH is as follows:

CH3CO2H + OH− → CH3CO2− + H2O

For a more specific calculation, we would need additional information such as the concentration of the acid solution and the concentration of KOH solution.