Define Ebullioscopic Constant

Define ebullioscopic constant.

The molal elevation constant, also known as the ebullioscopic constant, is a constant quantity used to calculate the elevation in the boiling point of a solution observed when this non-volatile solute is added to it. 

This elevation in boiling point is observed when a solution contains both a volatile solvent and a non-volatile solute. To provide an appropriate response, you will need to review the principles and equations underlying colligative qualities, emphasizing the increase in boiling point.

Colligative characteristics are those qualities of a solution whose value depends entirely on the quantity of the solute particles rather than the attributes of the solute itself. These properties are referred to as “number-dependent” rather than “property-dependent.”

When the boiling point is compared to the pure solvent, the elevation in boiling point quantifies the degree to which the boiling point of a solution that has a non-volatile solute dissolved in it reaches a higher temperature than the boiling point of the pure solvent. This increase in the boiling point may be calculated using the formula,

△T_b = K_b x m x i

Where K_b denotes the molal elevation constant or ebullioscopic constant, the molality of the produced solution is denoted by m. Also, i is the Van’t Hoff Factor. The formula for molal elevation constant may be derived from this formula as

K_b = △T_b/m

As result, we can determine that the ebullioscopic constant, also known as the molal elevation constant, is the rise in the boiling point of a solution when its molality is equal to unity. In other words, it is the rise in boiling point that occurs when one mole of a nonvolatile solute is introduced to one kilogram of pure volatile solvent. It is a characteristic constant, and its value is determined only by the type of the solvent, not the solute.