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Dissolve in water
Two ways of preparation
Metal/ metal oxide/ metal carbonate and an acid
1. Measure out a volume of acid.
2. Use a spatula to add the solid metal oxide to the excess. This means that you keep adding the solid until a resdue remains in the mixture.
3. Filter out the excess, unreacted solid.
Heat the filtered solution on a bunsen burner to exaporate the water, leaving behind the soluble salt crystals.
Acid and alkali (two solutions)
1. Preform a titration: measure 25cm(3) of NaOH into a conical flask and fill a burette with HCL.
2. Add a few drops of indicator (e.g. phenolphtalein) into the conical flask. Add the acid until the indicator changes colour and record the volume of acid added.
3. Repeat the above steps but do not use the indicator. Add 25cm(3) of acid.
4. Heat the solution formed in the conical flask on a bunsen burner to exaporate the water, leaving behind soluble salt crystals.
Filter out the precipitate and wash with distilled water. Leave in an 'oven' to dry.
Mix the two solutions together and a solid precipitate will form.
Formed when two salt solutions are mixed together.
Often used to form paints, as they can be brightly coloured precipitates.