Question

В двух пробирках Na2SO4 B Na2CO3.Проведите реакции,доказывающие наличие этих веществ в пробирках,с учетом качественных реакций.

Answer 1

Мне кажется так должно быть

Answer 2

Testing for Na2SO4 and Na2CO3 in Test Tubes

To test for the presence of Na2SO4 and Na2CO3 in the given test tubes, we can perform qualitative reactions to confirm their presence.

Qualitative Reaction for Na2SO4: 1. Barium Chloride Test: When a solution of barium chloride (BaCl2) is added to a solution containing sulfate ions (SO4^2-), a white precipitate of barium sulfate (BaSO4) is formed.

Qualitative Reaction for Na2CO3: 2. Acid Test: When a carbonate (CO3^2-) reacts with an acid, it produces carbon dioxide (CO2) gas, which can be tested by its effervescence.

Procedure

1. Barium Chloride Test for Na2SO4: - Add a few drops of barium chloride solution to the solution in the first test tube containing Na2SO4. - Observe the formation of a white precipitate, which confirms the presence of sulfate ions.

2. Acid Test for Na2CO3: - Add dilute hydrochloric acid (HCl) to the solution in the second test tube containing Na2CO3. - Observe the effervescence of carbon dioxide gas, which confirms the presence of carbonate ions.

Conclusion

By performing the barium chloride test and the acid test, we can confirm the presence of Na2SO4 and Na2CO3 in the respective test tubes based on the qualitative reactions observed.