An excess of copper(II) oxide is added to dilute sulfuric acid to make crystals of hydrated copper(II) sulfate. The processes listed may be used to obtain crystals of hydrated copper(II) sulfate. 1 2 3 4 concentrate the resulting solution filter heat the crystals wash the crystals Which processes are needed and in which order?
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Answer:
Wear eye protection throughout.
Be very careful not to knock the tripod while the beaker is on it. Consider clamping the beaker.
When heating the copper(II) oxide and dilute sulfuric acid, avoid boiling off the water and allowing the copper sulfate to appear and then decompose with excessive heating – this is unsafe. The sulfur dioxide gases are toxic and can cause breathing difficulties.
In the final (optional) stage of the procedure, do not attempt to evaporate the acid to obtain crystals by heating with a Bunsen burner after filtering. This action would fill the lab with toxic fumes.
Provide the reagents in ready-measured quantities to reduce waste and assist lesson organisation. All containers must be clearly labelled.
Copper(II) oxide, CuO(s), (HARMFUL, DANGEROUS TO THE ENVIRONMENT) – see CLEAPSS Hazcard HC026. The copper(II) oxide powder can be provided in approximately 1 g quantities in labelled specimen tubes or plastic weighing boats.
Dilute sulfuric acid, H2 SO4 (aq), (IRRITANT at concentration used) – see CLEAPSS Hazcard HC098a. 20 cm3 of the dilute sulfuric acid should be provided in small labelled bottles.
Copper(II) sulfate, CuSO4 (s), (HARMFUL, DANGEROUS TO THE ENVIRONMENT) – see CLEAPSS Hazcard HC027c.
Explanation:
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