Very dilute sodium chloride solution is electrolysed. Which test provides a positive result for the gas produced at the anode?
Question
Very dilute sodium chloride solution is electrolysed. Which test provides a positive result for the gas produced at the anode?
Solution
The gas produced at the anode during the electrolysis of a very dilute sodium chloride solution is chlorine.
To test for chlorine gas, you can use damp litmus paper. Chlorine gas will bleach the litmus paper, turning it white. This is a positive result for the presence of chlorine gas.
Here are the steps:
- Dampen a piece of litmus paper (either red or blue will work).
- Hold the damp litmus paper in the path of the gas being produced at the anode.
- If the litmus paper turns white, this indicates the presence of chlorine gas.
Remember to be careful when handling chlorine gas, as it is toxic and can be harmful if inhaled.
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