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Ionic Salts and Their Characteristic

Why does pres...

Question

Why does presence of excess of lithium makes LiCl crystals pink!?

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Solution

When LiCl crystal is heated in presence of Li, the chloride ions move to the surface of the metal and combine with Li.
Li + Cl^- ------> LiCl + e^-.
The electrons produces diffuse into the crystal and occupy the holes (anion vacancies) produced by the missing halide ions.

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