ACIDS & BASES A2 CHEMISTRY 9701

Thes 127 slides adress the following syllabus objectives for a student sitting A2 chemistry:
Candidates should be able to:
1 understand and use the terms conjugate acid and conjugate base
2 define conjugate acid–base pairs, identifying such pairs in reactions
3 define mathematically the terms pH, Ka pKa and Kw and use them in calculations (Kb and the equation
Kw = Ka × Kb will not be tested)
4 calculate [H+ (aq)] and pH values for:
(a) strong acids
(b) strong alkalis
© weak acids
5 (a) define a buffer solution
(b) explain how a buffer solution can be made
© explain how buffer solutions control pH; use chemical equations in these explanations
(d) describe and explain the uses of buffer solutions, including the role of HCO3– in controlling pH in blood
6 calculate the pH of buffer solutions, given appropriate data
7 understand and use the term solubility product, Ksp
8 write an expression for Ksp
9 calculate Ksp from concentrations and vice versa
10 (a) understand and use the common ion effect to explain the different solubility of a compound in a
solution containing a common ion (b) perform calculations using Ksp values and concentration of a common ion