Hydroxide Precipitates Flashcards
1
Q
How is this test carried out?
A
Sample put in test tube
Few drops of dilute sodium hydroxide solution added
2
Q
Colour of precipitate for Calcium ions
A
White
3
Q
Colour of precipitate for copper ions
A
Blue
4
Q
Colour of precipitate for Iron(II) ions
A
Blue
5
Q
Colour of precipitate for aluminium ions
A
White
6
Q
Colour of iron(III) ions precipitate
A
Brown
7
Q
what happens to aluminium hydroxide precipitate when excess dilute sodium hydroxide is added?
A
The precipitate dissolves - forming a colourless compound - this can be used to distinguish between testing for calcium ions and magnesium ions
