Preparation of Salts By SK Chan

Preparing sodium chloride Add NaOH to HCl slowly to get a neutral solution. (How?) Concentrate the solution by evaporation until some white crystals around the edge of solution are seen. Leave the solution to evaporate slowly at room temperature to get bigger crystals. Separate the crystals by filtration.

How to get a neutral solution?

Preparing salt from an acid and a base, CuSO 4.5H 2 O Add black copper oxide to sulphuric acid and stir with a glass rod. Keep adding until no more will dissolve (react). Filter the mixture in another beaker. Pour the solution into an evaporating dish. Stop heating when some crystals are seen around the edge of solution. Leave the solution to crystallize slowly.

Preparing salt from an acid and a base, CuSO 4.5H 2 O

Making insoluble salts Some salts are insoluble. They can be prepared by a precipitation reaction.

Other methods for soluble salts Acid + carbonate salt + water + carbon dioxide

Other methods for soluble salts Acid + metal salt + hydrogen

Salt preparation project Decide a salt for your group. Design an experiment to prepare it. In a piece of paper, write down the chemicals and apparatus required; draft the experimental procedure and hand it to your teacher for comment.

Salt preparation project Decide a salt for your group. Design an experiment to prepare it. In a piece of paper, write down the chemicals and apparatus required; draft the experimental procedure and hand it to your teacher for comment.

Salt preparation project After making modification (if needed) to your designed experiment. Carry out the preparation in the laboratory periods. Write a report on the designed experiment.

Writing a laboratory report Title Date Objective(Name of the salt crystals prepared) Chemicals and apparatus Principle (Which method? Equation of reaction, Separation method) Procedure Result (What is the appearance of your crystals?)