Preparation of salts
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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.

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Preparing sodium chloride l.jpg
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.



Preparing salt from an acid and a base cuso 4 5h 2 o l.jpg
Preparing salt from an acid and a base, CuSO4.5H2O

  • 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.



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Making insoluble salts

  • Some salts are insoluble.

  • They can be prepared by a precipitation reaction.


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Other methods for soluble salts

  • Acid + carbonate  salt + water + carbon dioxide


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Other methods for soluble salts

  • Acid + metal  salt + hydrogen


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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 project10 l.jpg
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 project11 l.jpg
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.


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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?)


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