This table contains information on three indicators - HSC - SSCE Chemistry - Question 7 - 2060 - Paper 1
Question 7
This table contains information on three indicators.
| Indicator | pH range | Colour (lower pH – higher pH) |
|------------------|-------------|----------... show full transcript
Worked Solution & Example Answer:This table contains information on three indicators - HSC - SSCE Chemistry - Question 7 - 2060 - Paper 1
Step 1
Identify the pH range for Methyl Orange
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Answer
Methyl orange turns yellow when the pH of the substance is above 4.4, indicating that the substance's pH is above this range.
Step 2
Identify the pH range for Methyl Red
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Answer
Methyl red also turns yellow when the pH is above 6.2. Since it produced a yellow color, the pH must be above this value.
Step 3
Identify the pH range for Phenolphthalein
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Answer
Phenolphthalein remains colourless below a pH of 8.3, confirming that the pH of the substance is within this range.
