What are the two tests that can be used to identify positive ions?
1. Flame Test 2. Sodium Hydroxide Solution
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Lithium (Li +)
Crimson (red)
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Sodium (Na+)
Yellow
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Potassium (K+)
Lilac
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Calcium (Ca 2+)
Red
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Barium (Ba 2+)
Green
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Most metal ions with 2+ and 3+ charges are what in water?
Insouble
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When Sodium Hydroxide is added to solutions of metal ions with 2+ and 3+ what is formed?
A precipitate of of the metal hydroxide
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Aluminium ions
White Percipitate
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Calcium ions
White Percipitate
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Magnesium ions
White Percipitate
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What happens to the precipitate of the aluminium hydroxide when excess sodium hydroxide solution is added?
it dissolves
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Copper Hydroxide
Blue
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Iron (II) hydroxide
Green
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Iron (III) hydroxide
Brown
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A few drops of sodium hydroxide solution were added to a colourless solution and a white percipitate appeared. When excess sodium hydroxide was added the precipitate remained. Which metal ion could be present?
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