How to Make Anhydrous Magnesium Sulphate

To make anhydrous magnesium sulfate, you need to remove the water molecules from hydrated magnesium sulfate (known as Epsom salt). Here's a step-by-step guide on how to make anhydrous magnesium sulphate:

Materials you'll need:

Epsom salt (magnesium sulfate heptahydrate)
Heat-resistant container
Bunsen burner or other heat source
Desiccator (optional)
Safety goggles and gloves

Procedure:

Put on safety goggles and gloves to protect your eyes and skin.
Weigh the desired amount of Epsom salt (magnesium sulfate heptahydrate). The molar mass of magnesium sulfate heptahydrate is 246.47 g/mol.
Transfer the Epsom salt into a heat-resistant container. A porcelain crucible or a glass beaker with high-temperature resistance would be suitable.
Heat the container gently using a Bunsen burner or another heat source. Apply the heat gradually to prevent any splattering or violent reactions.
Continue heating the container until the Epsom salt turns white and appears dry. The temperature required for dehydration is around 250°C (482°F).
Maintain the heat for a sufficient duration to ensure the complete removal of water molecules. Stir the salt occasionally to ensure even heating.
Once you're confident that all the water has evaporated, remove the container from the heat source and allow it to cool to room temperature.
Store the anhydrous magnesium sulfate in airtight containers to prevent moisture absorption. If you have a desiccator, you can place the magnesium sulfate inside it to ensure it remains dry.