What is Formality

What is Formality? Explain With Example

The number of grams of formula masses of solute dissolved per litre of solution is known as the formality of a solution. The sign F represents the formality of a solution. Normalcy and formality have a lot in common. The term formality is frequently used to define the concentration of ionic solids made up of networks of ions rather than molecules. A formal solution is a solution with a formality of one and contains a one-gramme formula mass of solute per litre of solutions. The total of the atomic masses of all the atoms in a formula unit of a compound could be expressed as the formula mass of any substance. It is often referred to as formula weight. The following method is used to determine formality:  

Formality: Number of gram formula masses of solute/ volume of solution in litre.

For example, A liquid containing 0.1 mol of Na+ and 0.1 mol of Cl– is obtained by dissolving 0.1 mol of NaCl in 1 L of water.

The formality of any solution is a temperature-dependent parameter, which means that the formality of a solution changes as the temperature changes. The word formality is used to differentiate the number of moles of just a chemical from the number of moles of ions in a weak electrolyte and ionic compound solutions.