(i) Predict a physical property of this compound.
(b) Predict the chemical changes that take place, if any, when
astatine is added to an aqueous solution of potassium iodide.
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more reactive halogen can displace a less reactive halogen from solutions of its salts. For example, chlorine is more reactive than iodine. A solution of chlorine can displace iodine from potassium iodide solution:
chlorine + potassium iodide → potassium chloride + iodine
Cl2(aq) + 2KI(aq) → 2KCl(aq) + I2(aq)
The reaction mixture turns darker and iodine solution forms.
The slideshow shows what happens when solutions of chlorine, bromine and iodine are added to various potassium halide salts.
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