Chapter 1.

Overview

Analysis of a Solution of Two Acids

The learning objectives of this experiment are as follows:

• Use titration techniques to titrate a solution containing two acids with a standardized base.
• Using mole ratios of acid to base and the molarity of the standardized base, determine the concentrations of two acids, present in the same solution.
• Understand the relationship between the K_a, K_b, and K_w for weak acids and bases.

The Department of Chemistry and Biochemistry

The Ohio State University

Intro

Acid–base chemistry is fundamental to all life processes and we began our foundation of acids and bases early in the first chemistry course. We continue our discussion now by introducing a scale, pH, to quantify the strength of acids and bases. In lecture we are talking in depth about weak acids and weak bases and their relationship to water ionization. We have been familiarizing ourselves with new equilibrium constants K_a, K_b, and K_w.

Titration is a practical laboratory skill used to determine the concentration of ions in solution. We have performed an acid–base titration in the previous lab course. We will continue to perfect our titration techniques in this lab by titrating a solution containing two weak acids.

Procedure

Treatment of Data

Disposal of Chemicals

Credits