Which indicator would be best for this titration?
| Indicator | Colour change range (pH) |
|---------------------|--------------------------|
| A - HSC - SSCE Chemistry - Question 5 - 2019 - Paper 1
Question 5
Which indicator would be best for this titration?
| Indicator | Colour change range (pH) |
|---------------------|--------------------------|
| A. Martius... show full transcript
Worked Solution & Example Answer:Which indicator would be best for this titration?
| Indicator | Colour change range (pH) |
|---------------------|--------------------------|
| A - HSC - SSCE Chemistry - Question 5 - 2019 - Paper 1
Step 1
Identify the pH range required for the titration
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Answer
To determine the best indicator for the titration, it is important to know the pH range over which the equivalence point of the titration occurs. This information is typically based on the nature of the acids or bases involved.
Step 2
Analyze the provided indicators
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Answer
You have four indicators to consider:
Martius yellow: pH 2.0 – 3.2
Magdala red: pH 3.0 – 4.0
Isopricamic acid: pH 4.0 – 5.6
Cresol red: pH 7.2 – 8.8
Depending on the equivalence point pH, the indicator that changes color closest to this value will be the most suitable.
Step 3
Choose the best indicator
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Answer
If the equivalence point of the titration falls within the range of 4.0 – 5.6, the most appropriate choice is Isopricamic acid (C). This indicator will provide a clear visual change at the right pH, making it the best option for the titration discussed.
