Law of Definite Proportions: The Formula of a Hydrate

Objectives

• To use the law of conservation of mass and the law of definite proportions

• To calculate the simple formula of compounds

• To determine the moles of water of crystallization and the anhydrous fraction in a hydrated salt using percent and mass composition

Curriculum alignments

• NGSS

HS-PS1-7. Use mathematical representations to support the claim that atoms, and therefore mass, are conserved during a chemical reaction.

• IB DP

1.2 The mole concept

• AP

4.5 Stoichiometry

• Cambridge GCSE

1.7 Determine the mass of water in hydrated crystals