Describe a test to identify the gas used to sterilise water. [2 marks] Test Result
Question
Describe a test to identify the gas used to sterilise water. [2 marks] Test Result
Solution
Test: Collect a sample of the gas and bubble it through a solution of potassium iodide (KI) and starch.
Result: If the gas is chlorine, the solution will turn blue-black due to the formation of iodine-starch complex.
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