Cambridge A LEVEL Ionic equilibria



7.2 Ionic equilibria
Cambridge International aS & a level Chemistry 9701 syllabus. Syllabus content Syllabus for examination in 2019, 2020 and 2021.
a) show understanding of, and use, the Brønsted-Lowry theory of acids and bases, including the use of the conjugate acid, conjugate base (acid-I base-I, acid-II base-II) concept
b) explain qualitatively the differences in behaviour between strong and weak acids and bases and the pH values of their aqueous solutions in terms of the extent of dissociation
c) explain the terms pH, Ka, pKand Kand use them in calculations d) calculate [H+(aq)] and pH values for strong and weak acids and
strong bases
e) explain the choice of suitable indicators for acid-base titrations, given appropriate data
f) describe the changes in pH during acid-base titrations and explain these changes in terms of the strengths of the acids and bases
g) (i) explain how buffer solutions control pH
(ii) describe and explain the uses of buffer solutions, including the
role of HCO – in controlling pH in blood3
h) calculate the pH of buffer solutions, given appropriate data
i) show understanding of, and use, the concept of solubility product,

Kspj) calculate Ksp from concentrations and vice versa
k) show understanding of the common ion effect



7.3 Partition coefficients
a) state what is meant by a partition coefficient Kpc; calculate and use a partition coefficient for a system in which the solute is in the same physical state in the two solvents

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