...Acids, bases and salts yl:chemistry FRANCINE TAYLOR-CAMPBELL Contributor YOU SHOULD BE ABLE TO: f Define acid, acid anhydride, base, alkali, salt, acidic, basic, amphoteric and neutral oxides f Relate acidity and alkalinity to the pH scale f Discuss the strengths of acids and alkalis on the basis of their completeness of ionisation f Investigate the reactions of non-oxidising acids with metals, carbonates, hydrogen carbonates, bases f Investigate the reaction of bases with ammonium salts f Identify an appropriate method of salt preparation based on the solubility of the salt f Distinguish between acid salts and normal salts POINTS TO NOTE f Non-metals form acidic oxides, while metals form basic oxides. f Amphoteric oxides show both basic and acidic properties, while neutral oxides show neither. f Non-metallic oxides dissolve in water to form acids. f Metallic oxides are basic oxides and dissolve in water to form alkalis. f Acids combine with bases to form salt and water only. f Salts can be formed from the reaction of acids with carbonates, hydrogen-carbonates, alkalis and metals. f The pH of a substance indicates how acidic or basic (alkaline) its aqueous solution is. The pH scale goes from 0 - 14 with a pH less than 7 described as acidic and a pH greater than 7 described as basic or alkaline. One can use pH paper (litmus) or indicator solutions, such as methyl orange and phenolphthalein, to determine whether substances are alkaline...
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