Testing for Anions

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

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Carbonate

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-

precipitate.png

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.

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results of halogen test, showing corresponding colours

The ionic equations for these reactions are:

  1. 1
    Ag+ (aq) + Cl- (aq) ==>> AgCl (s)
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  2. 2
    Ag+ (aq) + Br- (aq) ==>> AgBr (aq)
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  3. 3
    Ag+ (aq) + I- (aq)
    ==>> AgI (aq)
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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 Mar 27, 2017, from https://scienceaid.net/chemistry/applied/testanions.html

MLA (Modern Language Association) "Testing for Anions." ScienceAid, scienceaid.net/chemistry/applied/testanions.html Accessed 27 Mar 2017.

Chicago / Turabian ScienceAid.net. "Testing for Anions." Accessed Mar 27, 2017. 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.

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Article Info

Categories : Applied

Recent edits by: Jamie (ScienceAid Editor)

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