Making an insoluble salt Zinc Sulfate
Using the image on the next slide, can you complete the table below? Hazard Risk Control
Making zinc sulfate
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
Mass of zinc oxide (g) Mass of zinc Sulfate (g) % yield
Calculating % yield Step 1 – theoretical yield Mass of zinc oxide x 161 81 Step 2 - % yield Actual mass x 100 = Theoretical mass
Why may % yield not be 100%? Discuss
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
Plenary Name the following salts NaCl MgSO4 KNO3 CaCl2
What are the name of the salts formed Sodium + Sulphuric acid Magnesium carbonate + Nitric acid Potassium oxide + Hydrochloric acid