Acids and bases 4.0 / 5 based on 1 rating ? ChemistryAcids, bases and saltsA2/A-levelAQA Created by: champion1607Created on: 26-05-18 15:42 What is a Bronsted-Lowry acid? Proton donors 1 of 20 What is a Bronsted-Lowry base? Proton acceptors 2 of 20 What are strong acids and bases? Acids and bases that dissociate almost completely in water 3 of 20 What are weak acids and bases? Acids and bases that dissociate only slightly in water 4 of 20 Define monoprotic Each molecule of an acid will release one proton when it dissociates 5 of 20 Define diprotic Each molecule of an acid will release two protons when it dissociates 6 of 20 pKa = -log(Ka) 7 of 20 Ka = 10-pKa 8 of 20 What indicator can you use for a strong acid/strong base? Methyl orange and phenolpthalein (pH 13) 9 of 20 What indicator can you use for a strong acid/weak base? Methyl orange (pH 9) 10 of 20 What indicator can you use for a weak acid/strong base? Phenolpthalein (pH 5-13) 11 of 20 What indicator can you use for a weak acid/weak base? No indicator can be used (pH 5-9) 12 of 20 What is a buffer? It is a solution that resists changes in pH when small amounts of acid or alkali are added 13 of 20 What is an acidic buffer? They have a pH of 7 or less, they contain a mixture of a weak acid with one of its salts 14 of 20 What is a basic buffer? They have a pH greater than 7, they contain a mixture of a weak base with one of its salts 15 of 20 Name a use of buffers Buffers are added to shampoo to maintain a constant pH of 5.5 16 of 20 pH = -log [H+] 17 of 20 [H+] = 10^-pH 18 of 20 pH of a weak acid = [H+] = √Ka [HA] 19 of 20 pH of a strong base = -log [kw / OH] 20 of 20
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