When anhydrous cobalt chloride paper is exposed to water, what color change is observed?
CHEMISTRY
JAMB 2023
When anhydrous cobalt chloride paper is exposed to water, what color change is observed?
- A. From pink to blue
- B. From white to blue
- C. From blue to white
- D. From blue to pink
Correct Answer: D. From blue to pink
Explanation
Anhydrous cobalt chloride paper is blue in the absence of water. However, when it comes into contact with water, it undergoes a color change to pink due to the formation of hydrated cobalt chloride.
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