# Exact and Approximate Calculations of Acid-Base Equilibria

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In this Demonstration, we show exact and approximate calculations for acid-base equilibria.

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Contributed by: A. Ratti, D. Meliga, L. Lavagnino and S. Z. Lavagnino (June 2021)

Open content licensed under CC BY-NC-SA

## Snapshots

## Details

Snapshot 1: Exact and approximate equations give the same result since the initial concentration is high and the extent of dissociation is very low (weak acid).

Snapshot 2: Exact and approximate equations are very different since we have a very high acid dissociation constant. In this case, the acid is completely dissociated (strong acid).

Snapshot 3: Incorrect use of the approximate equation gives the pH of a base although the solution is a slightly acidic.

Reference

[1] D. C. Harris, *Quantitative Chemical Analysis*, 8th ed., New York: W. H. Freeman and Company, 2010.

## Permanent Citation