Q6. Rahim found three old chemical bottles in the storeroom of his house. He wants to test whether these chemicals are acidic, basic or neutral. Which of the following indicators should he use to test the chemicals? (a) Beetroot juice (b) Turmeric strip (c) Vanilla essence (d) China rose
Answer (1)
To determine whether the chemicals Rahim found are acidic, basic, or neutral, he needs to use an indicator that changes color in different pH environments.
Beetroot juice : Beetroot juice changes color based on the pH level, turning pinkish-red in acidic environments and yellowish in basic environments, making it a viable natural indicator.
Turmeric strip : Turmeric is a natural pH indicator that changes color from yellow to red in basic conditions. However, it does not change color in acidic or neutral solutions, so it may not be the best choice for distinguishing acids.
Vanilla essence : Vanilla essence is not commonly used as a pH indicator. It does not change color based on the pH of the solution, so it is not suitable for this purpose.
China rose : China rose (Hibiscus) can act as a natural pH indicator. It typically turns red in acidic solutions and greenish in basic solutions.
Considering these explanations, the best indicators Rahim could use are (a) Beetroot juice and (d) China rose, as both can effectively show changes for both acidic and basic solutions. The other options either do not change color for certain pH levels or do not serve as indicators at all.
To conclude, the most reliable indicator option from the list that Rahim should use is (d) China rose .
