Which ion is present in each of the following samples? The sample gives white precipitate when treated with AgNO3 (silver nitrate). Cl- The sample gives white precipitate when treated with Na2CO3 (sodium carbonate). Cu+2 The sample gives off bubbles when treated with acid. CO2 Which ion or ions are shown to be absent from the following samples? The solution does not turn red when treated with KSCN (potassium thiocyanate). Fe+3 The solution does not turn dark blue when treated with ammonia (NH3) solution. Cu2+ If an unknown sample yielded the following results, then what is the formula for the unknown compound? Observation Ion Tested Result (+ or -) Reagent Added HNO3 No bubbles CO2 CO2 Remains clear Ca2+ AgNO3 White precipitate C Blood red Fe+3 KSCN Remains clear Cu2+ NH3 or NH4OH Cu2+ Symbol for anion present CO3^2- Symbol for cation present CuCO3 Formula for compound CuCO3 Sample of tap water with some silver nitrate (AgNO3)? What do you think would happen if you treated it with chloride form & cloudy solution? It would form silver chloride.