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Chapter 8 salt part 2
This document describes the purification of soluble salts through recrystallization and the preparation of insoluble salts through precipitation reactions. It discusses physical characteristics of salt crystals such as their geometric shape and fixed angles. It then provides examples of precipitation reactions used to prepare specific insoluble salts like lead (II) sulfate, copper (II) carbonate, and barium sulfate through a double decomposition reaction between aqueous solutions of their ions. General and ionic chemical equations are given to represent these precipitation reactions.
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Chapter 8 salt part 2
- 1. NURUL ASHIKIN BT.ABD RAHMAN PART 2
- 2. Learning Outcome Describethe purification of soluble salts by recrystallisation. List physical characteristics of crystals. Describe the preparation of insoluble salts. Write chemical and ionic equations for reactions used in the preparation of salts.
- 3. Impure Salt Dissolved in distilled water Dilute solution + Heat and evoporate to get impurities saturated solution + impurities Saturated Cool it. Pure crystals solution + Crystallisation formed. Filter impurities process begins crystal out.
- 4. CuSO4 NaCl KMnO4 FeSO4 K2Cr2O7
- 5. Fixed geometrical shapes Flatsurface, straight edges and sharp angles. Fixed angles between two adjacent surfaces. Same substance have same shapes but different sizes
- 6. • Use precipitationmethode by double decomposition reaction. • Aqueous solutions containing the ions of the soluble salt are mixed together to form the salt. • The precipitated salt is the filtered out, washed and dried.
- 7. Lead (II) Sulphateis prepared as follows: Lead (II) Sulphate Cation: Choose Anions: choose any soluble lead any soluble Pb2+ SO4 2- sulphate salt (II) salt Ex:Pb(NO3)2 Ex: K2SO4 Chemical equation Pb(NO3)2 (aq) + K2SO4 (aq) PbSO4 (s) + 2KNO3 (aq) Chemical equation Pb2+ (aq) + SO4 2- (aq) PbSO4 (s)
- 8. The general equationcan be represented by: AY (aq) + BX (aq) AX (s) + BY (aq) Ionic equation can be represented by nAm+ (aq) + mX n- (aq) AnXm (s)
- 9. Copper (II) Carbonateis prepared as follows: Copper (II) Carbonate Cation: Choose Anions: choose any soluble any soluble Cu2+ CO3 2- Copper (II) salt Carbonate salt Ex: CuSO4 Ex: Na2CO3 Chemical equation CuSO4 (aq) + Na2CO3 (aq) CuCO3 (s) + Na2SO4 (aq) Chemical equation Cu2+ (aq) + CO3 2- (aq) CuCO3 (s)
- 10. Barium Sulphate isprepared as follows: BariumSulphate Cation: Choose Anions: choose any soluble any soluble Ba2+ SO4 2- Barium salt sulphate salt Ex: BaCl2 Ex: Na2SO4 Chemical equation BaCl2 (aq) + Na2SO4 (aq) BaSO4 (s) + 2NaCl (aq) Chemical equation Ba2+ (aq) + SO4 2- (aq) BaSO4 (s)