CHEMISTRY FOR STPM

SCHOOL-BASED ASSESSMENT : PRACTICAL CHEMISTRY

EXPERIMENT 10: Ionic Equilibrium

The following result and answers are used as guidelines for calculation and solution for the question of (c) to (g)

Results:
(b) Record and complete your readings in the table below:









(d) Dilution decreases the concentration and hence increases the pH
(e) Dilution decreases the concentration and hence increases the degree of dissociation
(f) as shown in the table above.
(g) Dilution has no effect on Ka.

Precaution step:
the bulb of pH meter must be immersed in the buffer solution before next measurement is being carried out.
measurement of pH should can done from the most diluted acid to the most concentrated acid in order to attain more accurate reading of pH.