(a) When hydrated sodium sulphate crystals are heated gently, water is given off. State the name of the reagent used to test the presence of water and the expec
Physique/Chimie
isimbigaella95
Question
(a) When hydrated sodium sulphate crystals are heated gently, water is given off. State the name of the reagent used to test the presence of water and the expected observation for a positive test. (b) Pure oxygen for industrial use can be obtained from atmospheric air. State the percentage composition of oxygen gas by volume in air. (2