Cobalt Chloride Indicator Paper / Relative Humidity

Cobalt Chloride Indicator Paper / Relative Humidity - Avogadro's Lab Supply

AEMP

$4.00 
SKU: 3000-11

Cobalt Chloride indicator paper. The vial contains 100 strips @ 3 mm x 45 mm.

Indicates relative humidity or moisture content with a color change.

Pink indicates high humidity while blue indicates low humidity.

Anhydrous cobalt (II) chloride (CoCl2) is blue. When this molecule reacts with water it forms the hydrated chloride (CoCl2. 2H2O) which is purple and then the hexahydrate form (CoCl2. 6H2O) which is pink.

Cobalt Cloride
This reaction is reversible, placing a pink strip in the bag of desiccant provided will absorb the moisture from the indicator yielding blue.