The Nineteenth Hole

Chemistry Help: What is this unknown substance?

In a lab in school, I had to find out an unknown substance, which has a metal and a non-metal component. It was a white powder. A flame test (putting it over a bunsen burner) produced no results. With 1.0 mol of Hydrochloric AAcid, it bubbled vigorously. With 1.0 mol of Sodium Hydroxide, it turned the substance into a cloudy liquid. The unknown substance and the sodium hydroxide put over a bunsen burner caused the substance to bubble and shoot out of the test tube. Adding BaCl2 and Hydrochloric Acid to the unknown substance made it turn milky white, and then with a flame test it bubbled. What is this substance?

Placing a liquid in a test tube and then placing the test tube in a flame .... ? Don't be surprised if the liquid quickly boils and "shoots out" of the test tube. That isn't a test, it's dangerous.

Aside from some poor lab technique, the most important test is the one where you combined the unknown with HCl and got "bubbling". The gas coming off is no doubt CO2 and the unknown is probably a carbonate. Since you also got a reaction with NaOH, then the cation will form an insoluble hydroxide.

The tests you have done won't work very well in pinning down the specific identity of the unknown unless you have some possibilities to choose from. My guess is that you have something like CaCO3 as the unknown.

========== Follow up ===========

It won't be PbSO4, since lead (II) sulfate won't bubble "vigorously" in HCl.

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