The document discusses four methods for preparing salts: 1) Reacting a metal with an acid, 2) Reacting an insoluble base with an acid, 3) Neutralizing an alkali with an acid through titration, and 4) Precipitation. It then provides examples of soluble and insoluble compounds, and explains how to specifically prepare zinc sulfate by reacting zinc powder with sulfuric acid. The document asks to describe how to prepare several example salts using these methods.

1. SALT PREPARATION
REVIEW

2. METHODS IN MAKING SALT
1. Reacting a metal with an acid
2. Reacting an insoluble base with an
acid
3. Neutralising an alkali with an acid by
titration
4. Precipitation

3. 1. Reacting a metal with an acid
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International (Singapore) Pte. Ltd.

4. Reacting a metal with an acid (cont.)
Copyright © 2006-2011 Marshall Cavendish
International (Singapore) Pte. Ltd.

5. 2. Reacting an insoluble base
with an acid

6. 3. Neutralising an alkali
with an acid by titration

7. 4. Precipitation
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International (Singapore) Pte. Ltd.

8. Soluble or Insoluble?
Soluble Compounds Insoluble Compounds
All salts of Group I elements
All nitrates
All ammonium salts
Most chlorides, bromides and iodides Chlorides, bromides and iodides of
silver and lead
Most sulfates Sulfates of calcium, barium and
lead
Group I hydroxides and carbonates Most hydroxides and carbonates
are soluble (calcium hydroxide is
slightly soluble)
Group I and II oxides react with water Most metal oxides

9. Soluble or Insoluble?
• Potassium bromide
• Silver bromide
• Sodium hydroxide
• Calcium sulfate
• Lead iodide

10. 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.

11. How will you prepare these salts?
• CuSO4 (Jorge & Holly)
• CaCl (Satu & Alicia)
• K2SO4 (Rizal & Vanessa)
• PbCl2 (Zaynab & Reem)

12. TO PREPARE SALT
Reacting a
metal with Reacting an
an acid
insoluble base
with an acid
Neutralising an
alkali with an Precipitation
acid by titration