Practical activity

Read the following sections before attempting the experiment.

In the online experiment you will measure the total hardness of a water sample by following the chemical reaction of Ca²⁺ and Mg ²⁺ ions with EDTA:

Task 1: You will determine the precise concentration of the EDTA solution by reaction with a calcium solution of known concentration; this process is called standardisation.

Task 2: Using the standardised EDTA solution, you will titrate a river water sample, and then calculate the concentration of calcium and magnesium ions in your sample.

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