The graph shows the changes in pH during a titration - HSC - SSCE Chemistry - Question 14 - 2015 - Paper 1
Question 14
The graph shows the changes in pH during a titration.
Which pH range should an indicator have to be used in this titration?
(A) 3.1–4.4
(B) 5.0–8.0
(C) 6.0–7.6... show full transcript
Worked Solution & Example Answer:The graph shows the changes in pH during a titration - HSC - SSCE Chemistry - Question 14 - 2015 - Paper 1
Step 1
Identify the equivalence point of the titration
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Answer
From the graph, we observe a significant change in pH at a specific volume. This point indicates where the titration reaches its equivalence point.
Step 2
Determine the pH at the equivalence point
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Answer
At the equivalence point, the graph shows that the pH is approximately around 8.5. This is crucial for selecting an appropriate indicator.
Step 3
Select the suitable pH range for the indicator
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Answer
An appropriate indicator should change color around the equivalence point. Considering the pH of around 8.5, the correct indicator range would be 8.3–10.0.
Step 4
Final choice
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