IB Chemistry SL 3.1.8 pH curves Question Bank

Practise IB Chemistry SL 3.1.8 by applying ph curves to exam-style questions.

Exam points

identify the relevant chemical structure, process or evidence
apply the correct chemical model or equation
evaluate the result using chemical reasoning and data

[Maximum number: 1]

Suggest how the end point of the titration might be estimated from the graph.

volume «found by extrapolation of the two best fit lines» required to give the

highest temperature

OR

extrapolate «two best fit» lines to the point where they meet

Marking guidance:

Accept "where lines through the points

meet".

Accept "at maximum temperature".

Accept "at $35 \mathrm{~cm}^{3}$ of HCl ".

1

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3.1.8—pH curves question 1