Salt preparation

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!!!