In this deck, you'll learn about the AQA required practical for investigating the electrolysis of aqueous solutions. We'll cover how to set up the experiment, identify the variables, and safely collect and test the products formed at each electrode. This practical helps demonstrate the rules that determine what is produced when you pass an electric current through a solution containing ions.

First, let's look at the setup. The experiment uses a power supply connected to two electrodes, which are placed into the aqueous solution you want to test. The solution itself is held in a container, typically a beaker. The electrodes must be inert, meaning they won't react with the solution or the products. Graphite is a common choice for inert electrodes.

To collect any gases produced, you can place an inverted, or upside-down, test tube filled with the solution over each electrode. As gas bubbles form, they will rise and displace the solution in the test tube, allowing you to collect a sample for testing.