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When bromine is dissolved in water the equilibrium shown below is established.
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State and explain the observation that would be made if aqueous sodium hydroxide was added to the equilibrium mixture.

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The yellow colour fades // Decolourisation of the mixture. Adding sodium hydroxide lowers the concentration of H+ ions. This makes equilibrium to shift to the right i.e. forward reaction is favoured lowering concentration of yellow Br2 molecules.

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