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 blue-green flame?
Copper ion, Cu2+
Calcium ion, Ca2+
Sodium hydroxide solution was added to a solution, a blue precipitate formed. Which ion was present in the 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+
A student wants to test for ammonium ions in a solution. What should she do?
Add universal indicator - the formation of a blue colour identifies ammonium ions
Add NaOH and warm - the formation of a gas that turns damp red litmus paper blue identifies ammonium ions
Add dilute acid - bubbles of gas that turn limewater cloudy identify ammonium ions
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
The addition of an acid and barium chloride solution to an unknown solution, formed a white precipitate. Which of these solutions could produce this result?
Sodium chloride
Sodium sulfate
Copper chloride
A colourless solution gave an orange-red colour with a flame test, and then a cream precipitate with acid and silver nitrate solution. What compound is present in the solution?
Copper carbonate
Potassium iodide
Calcium bromide