Barium was dissolved in dilute nitric acid, and a colorless gas, a non-salt-forming oxide, was evolved. The resulting solution

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

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.