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The addition of CaCl(2) to a KCl crystal...

The addition of `CaCl_(2)` to a `KCl` crystal lowers the density of the `KCl` crystal.

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T
Dopin with `Ca^(2+)` ions will create two vacant sites occupied by `K^(o+)` ions. One site will be occupied by `Ca^(2+)` ions leaving one site. So the density is lowered.
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