Question

1. Suppose you are titrating a dilute acetic acid solution in a flask with NaOH in the buret. Acetic acid is a weak acid that has the formula CH3COOH and the following structure: Which three species are present in the largest quantities in the flask before any NaOH is added? H+, OH-, H2O, CH3COOH, CH3COO-

2.For the titration of a dilute acetic acid solution with NaOH, rank the following species from highest to lowest in terms of quantity at the equivalence point, 1=highest quantity 4=lowest quantity CH3COOH, H2O, OH-, CH3COO-

Answer 1

Q1. The species present is largest quantities are : H₂O , CH₃COOH and H⁺

Explanation

Since the solution is a dilute solution, therefore largest quantity present will be water H₂O. After that acetic acid CH₃COOH will have the largest quantity since it is the solute. Acetic acid dissociates into hydrogen ions H⁺ and acetate ions CH₃COO^-

But H⁺ also comes from water dissociation into H⁺ and OH^-. Therefore, the next largest species would be H⁺

Q2.

Species	Ranking
H2O	1
CH3COO-	2
OH-	3
CH3COOH	4