Enter the heat of solution and the heat of lattice energy into the calculator to determine the heat of hydration.

Heat of Hydration Formula

The following equation is used to calculate the Heat of Hydration.

Hhyd = Hs – Hle

  • Where Hhyd is the heat of hydration
  • Hs is the heat of solution
  • Hle is the heat of lattice energy

To calculate a heat of hydration, subtract the heat of lattice energy from the heat of solution.

What is a Heat of Hydration?


A heat of hydration is a measure of the energy absorbed when one mole is hydrated.

How to Calculate Heat of Hydration?

Example Problem:

The following example outlines the steps and information needed to calculate Heat of Hydration.

First, determine the heat of solution. In this example, the heat of solution is measured to be 500 J.

Next, determine the heat of lattice energy. In this case, the heat of lattice energy is 300 J.

Finally, calculate the heat of hydration using the formula above:

Hhyd = Hs – Hle

Hhyd = 500 – 300

Hhyd = 200 J