There are powders in two bottles without labels: one contains calcium oxide, the other contains copper (II) oxide.
| February 27, 2021 | education
There are powders in two bottles without labels: one contains calcium oxide, the other contains copper (II) oxide. how to distinguish between these substances without conducting chemical experiments? How can chemical experiments confirm the presence of precisely these substances in the flasks?
Firstly, powders differ in color, secondly, in water solubility.
CaO – quicklime, white powder, readily soluble in water, with the formation of calcium hydroxide Ca (OH) 2 – slaked lime. The reaction proceeds very violently, with the release of heat. The tube is heated.
CaO + H2O = Ca (OH) 2.
CuO is a black-blue powder, insoluble in water. There is no reaction with water.
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