31st August 2018

sciencephoto
12

Why is blue cobalt chloride paper kept in a desiccator?

In this case, the items being kept dry are pieces of cobalt chloride paper, which are sensitive to humidity and turn from blue to pink if water vapour is present (serving also as a check on whether the dessicator is working). The dessicant (white) in the bottom of the chamber removes water vapour from the air.

Then, what color is cobalt chloride?

6H2O, which is one of the most commonly used cobalt compounds in the lab. The dihydrate is purple and hexahydrate is pink, whereas the anhydrous form is sky blue. Because of the ease of the hydration/dehydration reaction, and the resulting color change, cobalt chloride is used as an indicator for water in desiccants.

Is cobalt chloride aqueous?

The [CoCl4]2 ion is the blue ion that forms upon addition of hydrochloric acid to aqueous solutions of hydrated cobalt chloride, which are pink.
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