Download Syllabus Cambridge International A & AS Level Chemistry Syllabus code 9701

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5. Practical assessment
5.5 Qualitative analysis notes
[Key: ppt. = precipitate]
1 Reactions of aqueous cations
cation
reaction with
NH3(aq)
NaOH(aq)
aluminium,
Al 3+(aq)
white ppt.
soluble in excess
white ppt.
insoluble in excess
ammonium,
NH4+(aq)
no ppt.
ammonia produced on heating
–
barium, Ba2+(aq)
no ppt.
(if reagents are pure)
no ppt.
calcium, Ca2+(aq)
white ppt. with high [Ca2+(aq)]
no ppt.
chromium(III),
Cr3+(aq)
grey-green ppt.
soluble in excess giving dark green
solution
grey-green ppt.
insoluble in excess
copper(II),
Cu2+(aq),
pale blue ppt.
insoluble in excess
blue ppt. soluble in excess giving dark
blue solution
iron(II), Fe2+(aq)
green ppt. turning brown on contact with
air
insoluble in excess
green ppt. turning brown on contact
with air
insoluble in excess
iron(III), Fe3+(aq)
red-brown ppt.
insoluble in excess
red-brown ppt.
insoluble in excess
lead(II), Pb2+(aq)
white ppt.
soluble in excess
white ppt.
insoluble in excess
magnesium,
Mg2+(aq)
white ppt.
insoluble in excess
white ppt.
insoluble in excess
manganese(II),
Mn2+(aq)
off-white ppt. rapidly turning brown on
contact with air
insoluble in excess
off-white ppt. rapidly turning brown on
contact with air
insoluble in excess
zinc, Zn2+(aq)
white ppt.
soluble in excess
white ppt.
soluble in excess
[Lead(II) ions can be distinguished from aluminium ions by the insolubility of lead(II) chloride.]
Cambridge International A & AS Level Chemistry 9701. Examination in June and November 2012.
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