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Chapter 8 salt part 1
The document discusses learning outcomes about salts. It defines a salt as a compound formed when a hydrogen ion from an acid is replaced by a metal ion or ammonium ion. Examples of commonly used salts include NaCl, MSG, and CaCO3. Salts can be soluble or insoluble depending on their cation and anion. The document also describes different methods for preparing soluble and insoluble salts, such as titration, evaporation/heating, cooling/crystallization, filtration, and drying.
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Chapter 8 salt part 1
- 2. Learning Outcomes At theend of the lessons, students should be able to: a) state examples of salts used in daily life b) explain the meaning of salt c) identify soluble and insoluble salts d) describe the preparation of soluble salts.
- 3. Food preparation • NaCl-seasoning food • MSG- enhance food taste Medical • CaCO3 –antacid that reduce Uses of Food preservation • NaCl- salted fish acidity in the stomach of gastric patients salts • NaNO2 -preserve prosessed meat Agriculture • Nitrate salts- fertilisers
- 4. • Salt isformed in neutralization. • Salt : ionic compound. – anion part – acid Anion from – cation part – base the acid KOH(aq) + HCl(aq) KCl(aq) + H2O Cation from the base • Definition of salts A salt is a compound formed when the hydrogen ion, H+ from an acid is replaced by metal ion or ammonium ion, NH4+.
- 5. • SOLUBILITY An ability of a compound to dissolve in solvents Depends on the cation and anion present
- 6. Types of salts Solubility in water Sodium , Na N All are soluble Ammonium A Potassium ,K K Nitrate All are soluble Chloride All are soluble except PbCl2 P AgCl and HgCl. A H Sulphate All are soluble except Pantai PbSO4, CaSO4 and BaSO4 Cahaya Bulan Carbonate salts All are insoluble except Na2CO3 N (NH4)2CO3, ammonium carbonate A K2CO3 K
- 7. Type Of Salts Insoluble salt Soluble salt Salt that undissolve Salt that dissolve in water in water (at room (at room temperature) temperature) Before preparing salt: Soluble We must know whether the salt is or Have different method to prepare Insoluble salt
- 8. Example Solublesalts Insoluble salts AgCl PbCrO4 PbCl2 PbI2 NaOH BaSO4 NH4OH PbSO4 Lead halide such as PbCl2, PbBr2, PbI2 are soluble in hot water, but insoluble in cold water
- 9. •Sodium salts Acid + alkali salt + water •Potassium salts Example: HCl + NaOH NaCl + •Ammonium salts H2O Acid + metal oxide salt + water Other salts Example: CuO + H2SO4 MgSO4 + H2O Acid + metal salt + hydrogen gas Example: Mg + H2SO4 MgSO4 + H2 Acid + metal carbonate salt + water + carbon dioxide Example: CaCO3 + 2HNO3 Ca(NO3)2 + H2O + CO2
- 10. HCl + NaOH NaCl Titration method Evaporation/Heating Cooling/crystallization Filtration Dry
- 11. T-Titration H- Heat C- Cooling/Crystallisation F- Filtration D- Dry
- 12. Zn + 2HCl ZnCl2 + H2 Add metallic oxide/metal/carbonate oxide Heating Filtration Recrystallisation
- 13. A- Adding H- Heating F- Filtration R- Recrystallisation