Question

What is formality? Explain with examples.

Answer 1

Hint: The number of gram formula masses of the ionic solute dissolved per litre of solution is known as the formality of the solution. It is symbolised by $F$. The term formality is commonly used to describe the concentration of ionic solids, which are made up of a network of ions rather than molecules. Formal solution is a solution with a formality of one and contains one gramme formula mass of solute per litre of solution.

Complete answer:
Moles of solute per litre of solution are expressed by both molarity and formality. The overall concentration of a material in solution, regardless of its chemical structure, is known as formality. When $$0.1mol$$ of $$NaCl$$ is dissolved in $$1L$$ of water, the result is a solution containing $$0.1mol$$ of $$N{a}^{+}and0.1$$ mol of $$C{l}^{-}$$. Because there is basically no undissociated $$NaCl$$ in solution, the molarity of$$NaClis0$$. Instead, the solution is $$0.1MNa+and0.1MCl-.NaCl$$, on the other hand, has a formality of $$0.1F$$.
The number of formula masses of any solute dissolved in $$1litre$$ is the formality of the solution.

Note:
Let us know some more things about formality. The concentration of a specific chemical species is referred to as molarity. Formality, on the other hand, is the overall concentration of a substance, regardless of its chemical form. If a chemical dissolves without dissociating into ions, its molarity and formality are irrelevant.