Learning goals

After completing this laboratory exercise, you should be able to:

Explain the relation between mass, moles, and numbers of atoms or molecules, and perform calculations deriving these quantities from one another
Determine the number of moles of water per mole of the anhydrous compound in the given unknown, from which determine the hydrate's empirical formula.
Become familiar with gravimetric analysis.

What is MOLE?
Empirical Formula of a Hydrate
Lab Slides

The mole is an amount unit similar to familiar units like pair, dozen, gross, etc. It provides a specific measure of the number of atoms or molecules in a bulk sample of matter. A mole is defined as the amount of substance containing the same number of discrete entities (atoms, molecules, ions, etc.) as the number of atoms in a sample of pure ¹²C weighing exactly 12.0000 g. The mole provides a link between an easily measured macroscopic property, the mass, and an extremely important fundamental property, the count of atoms, molecules.

How to convert between mass, moles and number of particles?

Overview of Gravimetric Analysis

Gravimetric analysis is a class of lab techniques used to determine the mass or concentration of an analyte by measuring a change in mass.

A broad survey of gravimetric methods

Gravimetric Analysis.png

Experiment Instructions

Watch this slideshow

HOL_Hydrate.mp4

Slides PDF for taking notes