Question

so for my general unknown lab im testing for possible anion present

I followed procedure 33 and adding the H2SO4 it had a brown bubbly reaction and heating it up produced a brown gas.

i need help at determining the possible anion present.

TREATMENT OF THE UNKNOWN WITH CLASS REAGENTS PROCEDURE 33 Treatment of the Solid with H2SO4 The reagents H2SO4 (cold and hot), AgNO3, and BaCl2 give characteristic reactions that pro. vide useful information about the identity of the anions present. Sulfuric acid is used with the solid unknown, whereas the other two reagents are employed on solutions of the unknown Place as much of the solid as can be carried on in. of the tip of the spatula in a small test tube. Add 1 or 2 drops of 18 M H2SO4 (see Note 1). Notice everything that happens, particu- larly the color and odor of escaping gases (see Note 2, do not place your nose over the mouth of the test tube, but hold the tube a few inches away and fan any gas toward your nose). Then heat. but not so strongly that the H2SO4 is boiled, and note what happens. Finally heat the sides of the test tube over its entire length and note whether or not brown fumes (NO2) are formed (see Note 3). Do not look down into the test tube! Do not point the test tube at yourself or at your neighbor!

Answer 1

If the compound gives brown bubbly gas on adding H₂S0₄ and produces brown gas on further heating then it must be a chemical compound containing Bromide(Br^-) or Nitrite(NO₂^-) ion as the anions in it.

Further clarification of the anion in the compound needs the confirmatory test to be done for Bromide and Nitrite ions.