The unwelcome combination of high temperature and high humidity can drive us to the nearest pool or air-conditioned building, seeking relief. Heat and humidity are two factors that help determine our outdoor comfort level in summer. Why does blue cobalt chloride turn pink if left out in the open air? Cooling will shift the products towards the hydrated complex, which is more pink. If heat is added, the equilibrium will shift towards the cobalt chloride complex, which is blue in color. Why did the test tube turn blue in the hot water and pink in the cold water?Ī change in temperature or concentration of the ions will shift the equilibrium. A filter paper slip can be dipped in 3 to 5 percent cobalt chloride and dried. Dry cobalt chloride is blue, while moist one is pink. What happens when dry cobalt chloride paper is exposed to moisture?Ĭobalt chloride paper test is the hygrometric test for transpiration. Select one healthy leaf and clean the leaf to remove the water droplets using a filter paper.
The filter paper becomes blue in colour on drying.
Take some filter paper strips and dip them in the cobalt chloride solution. Take 3 % cobalt chloride solution from beaker and pour into the Petri dish. What happens to the filter paper strips in the 3% cobalt chloride solution? What color does the mixture of the two cobalt complexes turn when water is added?Ī solution of cobalt(II) ion in water is pink, the color of the complex ion formed between Co2+ ions and water molecules. CoCl2 reacts with moisture or water to form an acidic solution. Sky blue in color and will turn pink when exposed to air or moisture.
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