Learning OutcomesAt the end of the lessons, students shouldbe 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.
Food preparation • NaCl-seasoning food • MSG- enhance food tasteMedical• 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
• Salt is formed 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+.
• SOLUBILITY An ability of a compound to dissolve in solvents Depends on the cation and anion present
Types of salts Solubility in waterSodium , Na N All are solubleAmmonium APotassium ,K KNitrate All are solubleChloride All are soluble except PbCl2 P AgCl and HgCl. A HSulphate All are soluble except Pantai PbSO4, CaSO4 and BaSO4 Cahaya BulanCarbonate salts All are insoluble except Na2CO3 N (NH4)2CO3, ammonium carbonate A K2CO3 K
Type Of Salts Insoluble salt Soluble saltSalt that undissolve Salt that dissolve in waterin 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
Example Soluble salts Insoluble salts AgCl PbCrO4 PbCl2 PbI2 NaOH BaSO4 NH4OH PbSO4Lead halide such as PbCl2, PbBr2, PbI2 are soluble in hot water, but insoluble in cold water
•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