When doing a flame test, which ion is identified by the presence of a yellow flame?
Lithium ion, Li+
Sodium ion, Na+
Potassium ion, K+
When doing a flame test, which ion is identified by a green flame?
Copper ion, Cu2+
Calcium ion, Ca2+
Sodium hydroxide was added to a pale blue solution. A blue precipitate formed. Which ion was present in the blue solution?
Iron(II) ion, Fe2+
If a brown precipitate forms when sodium hydroxide is added to a mystery solution, which metal ion was present?
Iron(III) ion, Fe3+
A colourless solution was tested with a few drops of sodium hydroxide. A white precipitate formed. When excess sodium hydroxide was added, the white precipitate redissolved. Which ion was present?
Aluminium ion, Al3+
Which is the correct ionic equation for the reaction between copper(II) ions and hydroxide ions?
Cu2-(aq) + 2OH+(aq) → Cu(OH)2(s)
Cu3+(aq) + 3OH-(aq) → Cu(OH)3(s)
Cu2+(aq) + 2OH-(aq) → Cu(OH)2(s)
Which is the correct test for sulfate ions?
Add silver nitrate - a green precipitate is the positive result
Add sodium hydroxide - a yellow precipitate is the positive result
Add barium chloride solution - a white precipitate is the positive result
Some acid was added to a mystery solution. Bubbles of gas were made, which turned limewater cloudy. Which ion was present?
SO42-
CO32-
NH4+
When silver nitrate is added to a solution, a white precipitate forms. Which halide ion is present?
Chloride
Bromide
Iodide
A colourless solution gave an orange-red colour with a flame test, and then a cream precipitate with silver nitrate. What compound is present in the solution?
Copper carbonate
Potassium iodide
Calcium bromide