The chemist investigated in the laboratory a white crystalline substance A, readily soluble in water.

| March 6, 2021 | education

The chemist investigated in the laboratory a white crystalline substance A, readily soluble in water. When heated, substance A decomposes with the release of oxygen, brown gas and simple substance B of a silvery-gray color, which does not interact with acids with the release of hydrogen, but reacts with concentrated nitric acid. When hydrochloric acid is added to a solution containing substance A, a white curdled precipitate is formed. What are these substances? Write down the equations of the listed reactions.

1) A white curdled precipitate that precipitates upon interaction with hydrochloric acid indicates that A is a soluble silver salt.

2) A decomposes with the release of brown gas (nitric oxide (IV)) and oxygen, which means that salt A is silver nitrate, AgNO3. Simple substance B – silver, Ag.

Equations of the indicated reactions:

1) 2AgNO3 = 2Ag + 2NO2 ↑ + O2 ↑ (heating)

2) Ag + 2HNO3 (conc.) = AgNO3 + NO2 + H2O

3) AgNO3 + HCl = AgCl ↓ + HNO3



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