Metal Hydroxides Flashcards

All 6 cards in this deck

Which solution is added to a solution of a metal salt to identify the metal ion by the colour of a precipitate?

Sodium hydroxide solution.

What is seen when sodium hydroxide solution is added to a solution containing copper(II) ions?

A blue precipitate.

What is seen when sodium hydroxide solution is added to a solution containing iron(II) ions, and to one containing iron(III) ions?

Iron(II): green precipitate. Iron(III): brown precipitate.

Which three metal ions form white precipitates with sodium hydroxide solution?

Aluminium, calcium and magnesium ions.

What are the steps to show that a solution contains aluminium ions rather than calcium or magnesium ions?
e.g. testing aluminium chloride solution

1. Add a few drops of sodium hydroxide solution: a white precipitate forms.
2. Add excess sodium hydroxide solution.
3. The precipitate dissolves — aluminium ions are present.

What is the balanced symbol equation, with state symbols, for the precipitate formed when sodium hydroxide solution is added to a solution of iron(III) ions?

$Fe^{3+}(aq) + 3OH^-(aq) \rightarrow Fe(OH)_3(s)$