Why NaCl does not exist as molecules but aggregates of oppositely charged ions ?

Asked by rathee95abh | 18th Sep, 2015, 09:44: AM

Expert Answer:

In case of sodium crystal each Na+ ion is surrounded by six Cl ions and vice versa. It is difficult to identify that which Na+ ion belong to a given Cl ion or which Cl ion belong to a given Na+ ion . So, we select a combination of Na+ and Cl as a formula unit. The formula unit of an ionic compound is the simple collection of cations and anions which is electrically neutral. Formula unit does not exist as a separate entity. So due to this ionic compound like NaCl do not exist as discrete molecule in the crystal lattice but exist as aggregates of a very large number of oppositely charged ions.

Answered by Arvind Diwale | 18th Sep, 2015, 02:11: PM

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