Ch20 Acids, Bases and pH
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Describe the Arrhenius Model (1884) that explains Acid-Base behaviour:
Describe the Bronsted-Lowry Model (1923) of acid-base behaviour:
What is a conjugate base pair?
What are the components of an acid-base equilibria, with example:
Describe neutralisation of acid by an alkali using protons/hydronium ion:
What does Mono/Di/Tri..basic acids mean?
Describe the reaction of an acid with a base:
A neutralisation reaction occurs:
Describe the reaction of an acid with a carbonate:
A neutralisation reaction occurs:
Describe the reaction of an acid with an alkali:
A neutralisation reaction occurs:
Describe the reaction of an acid with a metal:
NOT a neutralisation reaction. Effervescence.
What is the pH scale? What do the numbers indicate? Does temp affect the pH?
What are the equations to calculate pH and [H+] of STRONG ACIDS
A strong acid is an acid that dissociates completely in a solution. For monobasic, times conc by 1 For dibasic, times conc by 2 For tribasic, times conc by 3 HA —–> H+ + A- For a strong acid, [HA] = [H+] , because it completely dissociates.
What is Ka? What is the equation for Ka?
What is the relationship between Ka and pKa?
What is the difference between weak acids and strong acids and what does the [H+] in weak acids depend on?
How can Ka be calculated using eqm concentrations?
What is the first approxiamations in the Ka equation?
What is the second approxiamation in the Ka equation?
How do you calculate the pH of weak acids? Provide the formula to calculate [H+]
How can you determine Ka experimentally?
How justified is approximation 1?
How justified is approximation 2?
What is Kw?
Kw is the ionic product of water The value of Kw @ 25ºC is 1.00 x 10-14 mol2dm-6 Rearrange the formula of Kw to get either [H+] or [OH-]
Prove that the pH of water @ 25ºC is 7:
