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How to make a salt by following these four methods
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SALT PREPARATIONREVIEW
METHODS IN MAKING SALT
1. Reacting a metal with an acid2. Reacting an insoluble base with an
acid3. Neutralising an alkali with an acid by
titration4. Precipitation
Copyright © 2006-2011 Marshall Cavendish International (Singapore) Pte. Ltd.
1. Reacting a metal with an acid
Copyright © 2006-2011 Marshall Cavendish International (Singapore) Pte. Ltd.
Reacting a metal with an acid (cont.)
2. Reacting an insoluble base with an acid
3. Neutralising an alkali with an acid by titration
Copyright © 2006-2011 Marshall Cavendish International (Singapore) Pte. Ltd.
4. Precipitation
Soluble or Insoluble?Soluble Compounds Insoluble CompoundsAll salts of Group I elementsAll nitratesAll ammonium saltsMost chlorides, bromides and iodides Chlorides, bromides and iodides of
silver and leadMost sulfates Sulfates of calcium, barium and
leadGroup I hydroxides and carbonates are soluble (calcium hydroxide is slightly soluble)
Most hydroxides and carbonates
Group I and II oxides react with water Most metal oxides
Soluble or Insoluble?
• Potassium bromide• Silver bromide• Sodium hydroxide• Calcium sulfate• Lead iodide
How will you prepare ZnSO4?
Since ZnSO4 is a soluble salt (Note: Most sulphates are soluble), I can use reaction with acid, base or carbonate or titration. If I have available acid and metal then I can do that instead of titration. I will then mix zinc powder with sulphuric acid until no effervescence is present. I will then filter it, collect the filtrate and crystallise it. Once I reach a saturated solution, I will let it cool. I will then wash it with distilled water to remove impurities and then dry it on filter paper.SAMPLE!!!
How will you prepare these salts?
• CuSO4 (Jorge & Holly)• CaCl (Satu & Alicia)• K2SO4 (Rizal & Vanessa)
• PbCl2 (Zaynab & Reem)
TO PREPARE SALT
Reacting a metal with an acid
Reacting an insoluble base with an acid
Neutralising an alkali with an acid by titration
Precipitation
Review!!!