Year 9 Practical task 2019
1. To a small sample of the unknown, add 2 drops Chloride ions
(2b) No Precipitate
(2a) Precipitate(PPTE)
Means that X is one of Na, K,
Mg, Zn, Ba, Fe(2) Fe(3), Cu
Means that X is one of
Ag, or Pb
2. To a small FRESH sample of the
unknown, add 2 drops Sulfate ions
(3a) No Precipitate
(3b) Precipitate
Means that X
is Ba
Means that X is one of
Mg, Zn, Fe(2) Fe (3), Cu
3. To a small FRESH sample of XY,
add 2 drops Hydroxide ions
(4a) Precipitate
Means that X is one of
Mg, Zn, Fe(2) Fe (3) Cu
PPTE Blue X= Cu,
Brown = Fe(3),
green = Fe(2)
PPTE white
Zn or Mg
(5a) Precipitate
dissolves
Means that X is Zn
4. To the same sample, add at least
5 more drops Hydroxide ions
(5b) Precipitate
remains
Means that
X = Mg