Tests for Positive Ions Flashcards
(8 cards)
1
Q
What test is done to identify metal ions?
A
The flame test gives different colours depending on the metal ion.
2
Q
What colour flame does Lithium (Li+) give?
A
A crimson flame.
3
Q
What colour flame does Sodium (Na+) give?
A
A yellow flame.
4
Q
What colour flame does Potassium (K+) give?
A
A lilac flame.
5
Q
What colour flame does Calcium (Ca2+) give?
A
A red flame.
6
Q
What colour flame does Barium (Ba2+) give?
A
A green flame.
7
Q
What other test is done to see metal ions?
A
Some metal ions form a precipitate with NaOH.
8
Q
What colour precipitates do these ions form:
a) calcium, Ca2+
b) copper(II), Cu2+
b) iron(II), Fe2+
c) iron(III), Fe3+
d) aluminium, Al3+
e) magnesium, Mg2+
A
a) white
b) blue
c) green
d) brown
e) white at first, the redissolves in excess solution to form a colourless solution
f) white
