Question

Give one example of a substance which contains:

(a) only ions

Answer 1

Ions

• A chemical species with a positive or negative charge is referred to as an ion.
• They are formed when an atom or a molecule receive or loose one or more electrons.

Electrolytes

• Electrolytes are those ionic compounds that allow the conduction of electricity, either in their aqueous solutions or in molten states.
• Electrolytes can be strong or weak.
• Strong electrolytes dissociates completely.
• All strong electrolytes contain only ions.
• For example, Sodium hydroxide $\left(\mathrm{NaOH}\right)$.
• Its dissociation is shown as follows:
• $\mathrm{NaOH}\left(\mathrm{s}\right)+\mathrm{Water}\left(\mathrm{l}\right)\rightleftharpoons {\mathrm{Na}}^{+}\left(\mathrm{aq}\right)+{\mathrm{OH}}^{-}\left(\mathrm{aq}\right)$