Question

Hydrogen gas passed over a heated sample of the oxide of copper in a ceramic container. The oxide of copper was reduced to copper metal. The following masses were measured.
Mass of ceramic container = 12.64 g, Mass of ceramic container + oxide of copper = 15.88 g, Mass of ceramic container + copper = 15.52 g
What mass of the copper was formed in the experiment? ​

Answer 1

In this experiment, students react an insoluble metal oxide with a dilute acid to form a soluble salt. By reacting copper(II) oxide, a black solid, with colourless dilute sulfuric acid, they produce copper(II) sulfate with a characteristic blue colour. Students can then obtain blue copper(II) sulfate pentahydrate crystals