1. Making an insoluble salt
Zinc Sulfate

2. Using the image on the next slide, can you complete the table below?
Hazard
Risk
Control

3. Making zinc sulfate

4. Solubility of salts – the rules
Soluble Salts
Insoluble Salts
All nitrates
Most sulfates
Most chlorides, bromides and iodides
Sodium carbonate, potassium carbonate
Sodium hydroxide, potassium hydroxide
None
Lead sulfate, barium sulfate
Silver chloride, silver bromide, silver iodide, lead chloride, lead bromide, lead iodide
Most other carbonates
Most other hydroxides

6. Mass of zinc oxide (g)
Mass of zinc Sulfate (g)
% yield

7. Calculating % yield
Step 1 – theoretical yield Mass of zinc oxide x Step 2 - % yield Actual mass x 100 = Theoretical mass

8. Why may % yield not be 100%?
Discuss

9. In practice, it is not always possible to get the calculated amount of product in a reaction:
reversible reactions may not go to completion
some product may be lost when it is removed from the reaction mixture
some of the reactants may react in an unexpected way

10. Plenary
Name the following salts
NaCl
MgSO4
KNO3
CaCl2

11. What are the name of the salts formed
Sodium + Sulphuric acid
Magnesium carbonate + Nitric acid
Potassium oxide + Hydrochloric acid