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AQA A Level Chemistry 3.1.12 - Acids and Bases Exam Question and Answers
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AQA A Level Chemistry 3.1.12 - Acids and Bases Exam Question and Answers
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AQA A Level Chemistry 3.1.12 - Acidsand Bases Exam
Question and Answers
Bronsted-Lowry acid - Answer>> Proton donor
Bronsted-Lowry base - Answer>> Proton acceptor
pH - Answer>> Measure of acidity by measuring concentration
of H⁺ ions.
Low pH means - Answer>> Acidity
High pH means - Answer>> Alkalinity
Calculating pH - Answer>> pH = -log [H⁺]
Calculating [H⁺] - Answer>> -pH
[H⁺] = 10
What does an acid/base reaction involve? - Answer>> Transfer
of the H⁺ from the acid to the base.
Strong acid - Answer>> Fully dissociates in water.
Weak acid - Answer>> Only very slightly dissociates in water.
Ka weak acid dissociation constant - Answer>> Ka = [H⁺] [A⁻]
[HA]
, The more a weak acid dissociates... - Answer>> The more H⁺
are formed.
The stronger the acid.
The larger the Ka value.
Calculating pKa - Answer>> pKa = -log (Ka)
Calculating Ka from pKa - Answer>> -pKa
Ka = 10
Dissociation of water - Answer>> H₂O ⇌ H⁺/H₃O⁺ + OH⁻
When water boils what happens to it's pH? - Answer>> Water
dissociating is endothermic, and the reverse reaction is
exothermic.
Le Chatelier's principle.
Equilibrium shifts to right to lower temperature.
More H⁺ so pH lower (more acidic).
Oxonium ion - Answer>> H₃O⁺
The ionic product of water (at 298K) - Answer>> Kw = [H⁺]
[OH⁻] = 1.0 x 10⁻¹⁴
Calculating pH of a base - Answer>> [H⁺] = Kw
[OH⁻]
Buffer - Answer>> Solution that maintains an almost constant
pH on addition of small amounts of strong acid or strong base.
What does an acidic buffer consist of? - Answer>> Weak acid
(HA) with its salt (Na⁺A⁻)
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