AP Lab 3: To Determine the Empirical Formula of Copper Chloride Hydrate (CuxCly . z H2O) Concepts: Law of conservation of mass, Law of definite proportion, Hydrates, Mole, chemical reactions, empirical formula Learning Resource: Powerpoint: Hydrates_annotated. pptPreview the document Instructions / Directions: 1) Watch the video below 2) Collect the data on a scratch paper. ***The only thing you need to include in this lab write up are as follows: a) Your name, title of lab, class period b) Lab objective c) Show all data and organized calculations d) Result *** Sample data: Before heating hydrate: Mass of empty crucible