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The graph below shows the change in pH of a reaction solution during a titration of 0.10 M NaOH with 0.10 M CH₃COOH - VCE - SSCE Chemistry - Question 4 - 2008 - Paper 1
Question 4
The graph below shows the change in pH of a reaction solution during a titration of 0.10 M NaOH with 0.10 M CH₃COOH. Titration of 20.00 mL 0.10 M NaOH with 0.10 M C... show full transcript
Worked Solution & Example Answer:The graph below shows the change in pH of a reaction solution during a titration of 0.10 M NaOH with 0.10 M CH₃COOH - VCE - SSCE Chemistry - Question 4 - 2008 - Paper 1
Step 1
A suitable indicator for the titration and the colour change observed is:
Answer
The appropriate indicator for this titration is phenolphthalein as it exhibits a color change from red to colourless. During the titration of acetic acid (CH₃COOH) with sodium hydroxide (NaOH), phenolphthalein will show a clear transition, which is appropriate for determining the endpoint of weak acid-strong base titrations. Thus, the correct answer is (D) phenolphthalein.