Attention: Safety Recall of Vernier Go Direct Charge Station. Click to learn more.


Structure 1.4.4—The empirical formula of a compound gives the simplest ratio of atoms of each element present in that compound. The molecular formula gives the actual number of atoms of each element present in a molecule.


Here are experiments our science specialists have selected to support this IB* topic.

The Determination of the Percent Water in a Compound

Experiment #2 from Advanced Chemistry with Vernier

In this experiment, you will

  • Carefully heat a measured sample of a hygroscopic ionic compound.
  • Determine the water of hydration of the compound.
  • Complete the chemical formula of the compound.

Educational Standard
International Baccalaureate (IB) 2025
Organizing concepts
Structure 1. Models of the particulate nature of matter
Structure 1.4—Counting particles by mass: The mole
Standard level and higher level

* The IB Diploma Program is an official program of the International Baccalaureate Organization (IBO) which authorizes schools to offer it. The material available here has been developed independently of the IBO and is not endorsed by it.