- Powdered Sulphur
- Glass tumbler/Gas jar
- Watch glass
- Deflagrating Spoon
- Spirit lamp
- Red and Blue litmus papers
Real lab procedure
- Take a small amount of sulphur using the deflagrating spoon.
- Introduce the spoon with burning sulphur into a glass tumbler/jar containing some water.
- Caution: Take care that the spoon should not dip in the water.
- Cover the tumbler/jar with a lid to stop the escape of gas produced during the burning of sulphur.
- Remove the spoon after some time.
- Shake the covered tumbler well to dissolve the gas in water.
- Transfer the solution to the watch glass.
- Dip one by one red and blue litmus papers in the solution and observe the change in the colour of the litmus papers.
- Drag and drop the lighter towards the spirit lamp to burn it.
- Click the bottle cap to open the sulphur bottle.
- Drag and drop the deflagrating spoon towards the bottle containing sulphur to collect the sulphur powder from the bottle.
- Drag and drop the deflagrating spoon containing sulphur powder towards the spirit lamp to burn the sulphur powder.
- Drag and drop the deflagrating spoon towards the gas jar containing water.
- Click on the gas jar lid to close it.
- Click on the glass lid to open the gas jar and remove the spoon and close the gas jar again.
- Click on the gas jar to shake it well to get the sulphur gas get dissolved completely.
- Click on the lid to open the gas jar.
- Drag and drop the gas jar towards the watch glass to pour the water onto it.
- Drag and drop the red litmus paper onto the watch glass.
- Drag and drop the blue litmus paper onto the watch glass.
- Click the reset button to redo the experiment.
- There is no change in the colour of red litmus paper.
- Blue litmus paper turns red.
- The non-metallic oxide after dissolving in water shows acidic character. Sulphur on burning in air forms sulphur dioxide gas, which dissolves in water and form sulphurous acid.
Sulphur + Oxygen (from air) → Sulphur dioxide
S + O2 → SO2
Sulphur dioxide + Water → Sulphurous acid
SO2 + H2O → H2SO3
- Sulphurous acid turns the colour of blue litmus paper red.
- Do not take too much sulphur to burn. It pollutes the air.
- Handle chemicals and hot surface carefully.