Barium was dissolved in dilute nitric acid, and a colorless gas, a non-salt-forming oxide, was evolved. The resulting solution was divided into three parts. The first one was evaporated to dryness, the resulting precipitate was calcined. A sodium sulfate solution was added to the second part until the precipitation ceased; sodium carbonate solution was added to the third. Write the equations for the described reactions.
4Ba + 10HNO3 → 4Ba(NO3)2 + N2O↑ + 5H2O
Ba(NO3)2 → Ba(NO2)2 + O2↑
Ba(NO3)2 + Na2SO4 → BaSO4↓ + 2NaNO3
Ba(NO3)2 + NaCO3 → BaCO3↓ + 2NaNO3
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