Q1.
Again, recall the chapter ‘Exploring Substances: Acidic, Basic, and Neutral’. Using an acid-base indicator, check whether the solution obtained after the addition of water to the gas jar is acidic or basic or neutral.
Answer
Burn a little powdered sulfur in a deflagrating spoon, lower it into a gas jar, cover the jar, then after 3 – 4 minutes add a small quantity of water, replace the lid and shake so that the gas dissolves. Test that solution.
| Indicator used | What you see | What it means |
|---|---|---|
| Blue litmus paper | Turns red | Acidic |
| Red litmus paper | Stays red (no change) | Not basic |
| China rose indicator | Turns dark pink | Acidic |
Caution: this is a demonstration activity for the teacher, and it must be performed in a fume hood or a well-ventilated area. Burning sulfur produces gases which can be harmful if inhaled.