Testing for Anions

Edited by Jamie (ScienceAid Editor), Taylor (ScienceAid Editor)


Ion CO32-, carbonate is found in limestone, or calcium carbonate (CaCO3).

To test for it, you must first: Add a dilute acid to the sample. A gas is given off which when tested should prove to be carbon dioxide.

Sulphate and Sulphide

Sulphate is SO42- and Sulphide is SO32-

By adding barium chloride to the solution you are testing, a white precipitate will form. If you add hydrochloric acid, the sulphate (SO42-) WILL NOT dissolve and the sulphite (SO32-) will.

Halogen Tests

The test for halogens, or halide ions, is to add silver nitrate to a solution. Often, nitric acid is added first as well. If there are chloride, bromide or iodide ions in the solution they will react with silver to form a precipitate. The different precipitates are summarized in the table below.

Was this helpful? Yes | No| I need help

The ionic equations for these reactions are:

  1. 1
    Ag+ (aq) + Cl- (aq) ==>> AgCl (s)
    Was this step helpful? Yes | No| I need help
  2. 2
    Ag+ (aq) + Br- (aq) ==>> AgBr (aq)
    Was this step helpful? Yes | No| I need help
  3. 3
    Ag+ (aq) + I- (aq)
    ==>> AgI (aq)
    Was this step helpful? Yes | No| I need help

Referencing this Article

If you need to reference this article in your work, you can copy-paste the following depending on your required format:

APA (American Psychological Association)
Testing for Anions. (2016). In ScienceAid. Retrieved Apr 25, 2024, from https://scienceaid.net/chemistry/applied/testanions.html

MLA (Modern Language Association) "Testing for Anions." ScienceAid, scienceaid.net/chemistry/applied/testanions.html Accessed 25 Apr 2024.

Chicago / Turabian ScienceAid.net. "Testing for Anions." Accessed Apr 25, 2024. https://scienceaid.net/chemistry/applied/testanions.html.

If you have problems with any of the steps in this article, please ask a question for more help, or post in the comments section below.


ScienceAid welcomes all comments. If you do not want to be anonymous, register or log in. It is free.

Article Info

Categories : Applied

Recent edits by: Jamie (ScienceAid Editor)

Share this Article:

Thanks to all authors for creating a page that has been read 20,585 times.


Thank Our Volunteer Authors.

Would you like to give back to the community by fixing a spelling mistake? Yes | No