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A solution of approximately 0.1 M benzoic acid, C₇H₆O₂, is titrated against a 0.1004 M solution of sodium hydroxide, NaOH - VCE - SSCE Chemistry - Question 6 - 2016 - Paper 1
Question 6
A solution of approximately 0.1 M benzoic acid, C₇H₆O₂, is titrated against a 0.1004 M solution of sodium hydroxide, NaOH. Which one of the following pH curves repre... show full transcript
Worked Solution & Example Answer:A solution of approximately 0.1 M benzoic acid, C₇H₆O₂, is titrated against a 0.1004 M solution of sodium hydroxide, NaOH - VCE - SSCE Chemistry - Question 6 - 2016 - Paper 1
Step 1
Identify the correct pH curve
Answer
In this titration of benzoic acid with sodium hydroxide, we expect a gradual increase in pH as NaOH is added due to the neutralization of the weak acid with a strong base.
As the titration approaches the equivalence point, there will be a sharp rise in pH, typically around a pH of 8 to 9 for benzoic acid because it is a weak acid.
Finally, after the equivalence point, the pH will level off, moving toward a value around 13 as excess NaOH is added.
Thus, the pH curve that best represents this titration is option D.