Prove empirically that ammonium sulfate contains NH4 and SO4 ions.
| July 5, 2021 | education
To determine the presence of NH4 + ions, it is necessary to add an alkali solution, for example, KOH, to a test tube with a solution of ammonium chloride, and heat. In this case, the evolution of gas – NH3 will be observed.
NH4Cl + KOH = KCl + H2O + NH3
An aqueous solution of ammonia is a base, and therefore the litmus paper dipped into a test tube should turn blue.
In addition, if you bring a glass rod soaked in concentrated hydrochloric acid to the test tube, you can observe the evolution of white smoke – NH4Cl.
NH3 + HCl = NH4Cl
A qualitative reaction to sulfate ions is the interaction with barium ions with the formation of a white precipitate BaSO4.
Ba2+ + SO42- = BaSO4
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