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I-11
3.
What was the change in pH when 2 drops of HCl was added to the water?
What volume of HCl was required to change the pH of the buffer one full unit?
What volume of HCl was required to change the pH of the buffer the second unit?
What volume of NaOH was required to change the pH of the buffer one full unit?
What volume of NaOH was required to change the pH of the buffer the second unit?
a)
Use the weak acid dissociation equilibrium and LeChâtelier’s Principle to explain the effect of
adding H3O
+
(in the form of the strong acid HCl) to the buffer solution.
i)
For the 1st pH unit change. (1.0 mark)
ii)
For the 2nd pH unit change. (0.8 marks)
