![]() The cookie is used to store the user consent for the cookies in the category "Analytics". This cookie is set by GDPR Cookie Consent plugin. These cookies ensure basic functionalities and security features of the website, anonymously. Necessary cookies are absolutely essential for the website to function properly. This can again be reversed by adding water. You can reverse these changes with solid cobalt chloride crystals. How can pink cobalt chloride crystals be changed back to blue cobalt chloride crystals? There is a close correspondence between colour and relative humidity, although the colour is influenced slightly by temperature. ![]() The surface of the leaf contains small, tiny microscopic openings called the stomata.Ĭobalt chloride paper is blue at low and pale red at high humidities, with a series of lilac colours between. When dried cobalt chloride paper is clipped on the under surface, the colour changes from blue to pink. What is the colour of the dry cobalt chloride paper? If the chloride or cobalt concentrations increase, the equilibrium will also shift towards the blue anhydrous cobalt chloride. 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. Which of the two cobalt containing ions is blue which is pink How do you know? The change in colour indicates that water is released on the undersurface of the leaf, which turns the paper moist. We know that the cobalt chloride turns from blue to pink under moist conditions. The colour change happens because the dried paper gets moistened by the water droplets released during transpiration.
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