In qualitative analysis, there are testing to identify Ag+ ion from other cations. Silver ion form soluble compounds, insoluble compounds, complex ions in water. Those characteristics are used to to test occurrence of Ag+ ion. AgCl, AgBr, AgI are famous insoluble compounds.
In this tutorial, we will learn followings of silver ion.
This experiment includes several steps. First, add aqueous ammonia to Ag+ ion solution. It will give AgOH. But AgOH immediately decomposes to Ag2O (Silver oxide) which is a black brown precipitate.
Then, add more ammonia to solution which contains silver oxide precipitate. You can see black brown precipitate dissolve and form colourless solutions.
Addition of dilute HCl gives a white precipitate of AgCl. AgCl is not soluble in water. This precipitate will dissolve in an excess of concentrated HCl acid and form colourless solution.
Also, that AgCl white precipitate is soluble in excess ammonia solution. It forms a colourless solution.
When aqueous potassium chromate (K2CrO4) solution to aqueous Ag+ ion solution. Abricked red precipitate is given. This precipitate is silver chromate (Ag2CrO4).
Silver bromide is a pale-yellow colour compound and insoluble in water.
Also, silver iodide is a yellow, water insoluble compound.