Positive cobalt chloride test for water

Positive cobalt chloride test for water

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This image is part of the sequence Science and technology: Cobalt chloride test for water

Credit: MARTYN F. CHILLMAID/SCIENCE PHOTO LIBRARY

Caption: Positive cobalt chloride test for water. The blue cobalt chloride test paper is held over a test tube of water. The humidity (water vapour) turns the paper from blue to pink. It is important that the paper is stored in low humidity before the test since exposure to 55% relative humidity or greater is sufficient to cause a slow colour change.

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Keywords: blue, chemical, chemistry, cobalt (ii) chloride, cobalt chloride, cobalt chloride test paper, color, color change, colour, colour change, experiment, humidity, no-one, nobody, school science, science education, test, test tube, vapor, vapour, water, white background

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