To find the ions, we need to know the properties of some metals.
Since we added chloride and carbonate ions and obtained precipitates, we need to know the solubilities and colours of the following salts: (S=soluble, I=insoluble)
Salt Solubility Colour
AgCl I White
CuCl2 S blue/green solution
BaCl2 S colourless solution
Salt Solubility Colour
Ag2CO3 I White
CuCO3 I blue (colour of oxidized copper roofs)
BaCO3 I white
Work with the tables above and solve the "puzzle" of the ions.
A solution contains one or more of the following ions: silver, barium, and Copper (II). CY 105 student adds sodium chloride to a small sample of the solution of the unknown and a white precipitate is formed. He/she filters out the precipitate and then add sodium carbonate to the filtrate and observes a formation of blue precipitate. What ions were present in the unknown?
1 answer