ANDREW LAMBERT PHOTOGRAPHY / SCIENCE PHOTO LIBRARY ANDREW LAMBERT PHOTOGRAPHY / SCIENCE PHOTO LIBRARY
Displacement reaction. Chlorine water (hypochlorous acid) being poured into a test tube containing aqueous potassium bromide (clear liquid, KBr). Chlorine water is an aqueous solution of chlorine (Cl2). On adding it to the potassium bromide, bromine (Br2, yellow) has formed in the test tube. This is caused by its displacement from the solution by the more reactive chlorine, resulting in a mixture of bromine water and potassium chloride (KCl) solution in the test tube. This result shows that chlorine should be ranked above bromine in a reactivity series. The reaction equation is: Cl2 + 2 KBr --> 2 KCl + Br2.
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