Tests for Anions Flashcards

All 6 cards in this deck

What is the test for carbonate ions, $\mathrm{CO_3^{2-}}$, and the result?

Add dilute acid — it fizzes; the gas given off turns limewater milky (cloudy), showing carbon dioxide.

What is the test for sulfate ions, $\mathrm{SO_4^{2-}}$, and the result?

Add dilute hydrochloric acid, then barium chloride solution — a white precipitate forms.

What is the test for chloride ions, $\mathrm{Cl^-}$, and the result?

Add dilute nitric acid, then silver nitrate solution — a white precipitate forms.

What colour precipitate does a bromide ion, $\mathrm{Br^-}$, give with dilute nitric acid and silver nitrate solution?

Cream.

What colour precipitate does an iodide ion, $\mathrm{I^-}$, give with dilute nitric acid and silver nitrate solution?

Yellow.

True or false? Dilute hydrochloric acid should be added before silver nitrate solution when testing for chloride ions.

False.
Hydrochloric acid contains chloride ions, so dilute nitric acid must be used instead.