Making Salts

• What is the purpose of a precipitation reaction in making salts?

  To make a pure, dry sample of an insoluble salt
• What two soluble salts are needed to make lead chloride?

  Lead nitrate and sodium chloride
• Write the balanced chemical equation for the reaction to make lead chloride.

  $Pb(NO₃)₂ +$$2NaCl → PbCl₂ +$$2NaNO₃$
• What is the method to make lead chloride using lead nitrate and sodium chloride?

  1. Dissolve 1 spatula of lead nitrate in deionised water.
  2. Dissolve 1 spatula of sodium chloride in a separate test tube.
  3. Mix both solutions in a beaker to precipitate lead chloride.
  4. Filter the mixture using filter paper.
  5. Rinse the beaker and filter paper with deionised water.
  6. Scrape the lead chloride onto fresh filter paper and leave to dry.
• What should you do after mixing the two solutions in the beaker?

  Pour the contents into a filter paper using a funnel
• Why is it important to rinse the beaker with deionised water after pouring the mixture into the filter paper?

  To ensure all the wanted product is collected
• What is the purpose of rinsing the contents of the filter paper with deionised water?

  To wash away all the soluble sodium nitrate
• What should you do with the lead chloride after rinsing it?

  Scrape it onto fresh filter paper and leave to dry
• What is the humorous remark made about lead chloride in the text?

  It was a-salt
• Suggest a method to make a pure sample of lead iodide from lead nitrate and potassium iodide.

  Use a precipitation reaction with lead nitrate and potassium iodide
• What are the steps involved in making soluble salts using an acid and an insoluble reactant?

  1. Choose the correct acid and insoluble reactant.
  2. Mix them to form a soluble salt.
  3. Filter the mixture to separate the insoluble product.
  4. Rinse and dry the product.
• Why is deionised water used in the preparation of lead chloride?

  To ensure there are no other ions present
• What is the difference between soluble and insoluble salts?

  Soluble salts dissolve in water, while insoluble salts do not