Testing For Water

This lesson covers two main tests for detecting the presence of water: using anhydrous copper II sulfate and cobalt II chloride paper. Anhydrous copper II sulfate turns from off-white to bright blue when hydrated, while cobalt II chloride paper changes from light blue to pink. The lesson also explores the historical use of cobalt II chloride as invisible ink, which becomes visible when heated. The video concludes with a summary of these methods and their respective color changes.

What happens to cobalt II chloride when it is heated after being written on paper?

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Summarize the two methods discussed for detecting the presence of water.

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