When phenolphthalein is added to an aqueous solution containing one of the following solutes the solution turns pink. Which solute is present?

Phenolphthalein is an alkaline solution indicator that gives the base solution a pink hue. Alkaline carbonate ions present in potassium acetate cause the solution to become pink.

Potassium Acetate (${\mathrm{KC}}_2{\mathrm{H}}_3{\mathrm{O}}_2$ ) is a salt  of SB and WA.