Chemlab: Chemistry 3/5

Natural Salt Solutions 1: Ion Exchange


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Introduction & Goals

Chemistry & Background

Key Questions

Prelab Problems



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Ion Exchange overview graphic
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Analytical Balance
In this two-week experiment, you will learn how to use an ion-exchange column and how to carry out an acid-base titration using an indicator. You will then apply these skills to determine the total concentration of cations in a sample of seawater. This week you will concentrate on understanding the chemistry of ion exchange and estimate the capacity of an ion exchange column from your observations.

Key Questions
1. Which ions are attached to the resin at the start of a given experiment?

2. Which ions are becoming attached to the resin and which are coming off, during each experiment?

3. How many equivalents of H+ will be replaced by the charging solution?

4. What will happen when the column reaches its capacity?
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