‫اﻻﺳﻢ ‪ /‬ﻧﻮره اﺣﻤﺪ اﻟﺰﻫﺮاﻧﻲ‬
Practical 4 : General chemistry I
The objective of this part is the Detection of Acid Radical Salt
Salt No ( 1 )
Physical properties :
1- Shape : Powder
2- Color : White
3- Solubility : Soluble in cold water
II- Chemical properties
Experiment
Solid salt + dil . HCI
Observation
Effervescence colorless
Confirmatory tests :
1 Salt solution +
magnesium sulphate
solution
Salt solution + mercuric
chloride solution
White precipitate of
magnesium carbonate
(MgCO3 )
Reddish brown
precipitate of mercuric
carbonate ( HgCO3 )
III- Name of the acid radical : Carbonate
Indication
The gas is CO2 odorless
gas is evolved . The anion
is carbonate or
bicarbonate
The anion is carbonate
The anion is carbonate
Its symbol : co3
Practical 4 : General chemistry I
The objective of this part is the Detection of Acid Radical Salt
Salt No ( 2 )
Physical properties :
1- Shape : Powder
2- Color : White
3- Solubility : Soluble in cold water
-2
II- Chemical properties
Experiment
Solid salt + dil . HCI
Observation
Effervescence and a
colorless odorless gas is
evolved.
Confirmatory tests :
1 Salt solution +
magnesium sulphate
solution
No ppt. in the cold, as
magnesium bicarbonate
is soluble, but heating,
white ppt of magnesium
carbonate is obtained
mercuric No ppt. in the
cold , but on heating a
reddish-brown ppt. of
mercuric carbonate is
obtained
Salt solution + mercuric
chloride solution
III- Name of the acid radical : BiCarbonate
Indication
The gas is CO2 odorless
gas is evolved . The anion
is carbonate or
bicarbonate
The anion is bicarbonate
The anion is bicarbonate
Its symbol : HCO3
Practical 4 : General chemistry I
The objective of this part is the Detection of Acid Radical Salt
Salt No ( 3 )
Physical properties :
1- Shape : big crystals
2- Color : White
3- Solubility : Soluble in cold water
II- Chemical properties
Experiment
Solid salt + dil . HCI
Observation
Colourless gas which turns
an acidified potassium
dichreomate paper green ,
is evolved, and a yellow
Indication
The gas is SO2, the ppt. is
s and the green colour is
Cr2(SO4)3. The anion is
thiosulphate
Confirmatory
1) Salt solution + lead
acetate solution
Pb(CH3COO)2
2) Salt solution +2 drops
of dil. H2SO4 + Iodine
solution(I2)
precipitate of sulphur
appears.
white ppt. of thiosulphate
(PbS2O3 ) is formed, the
ppt. turns black (PbS) on
boiling.
The brown colour of the
iodine solution disappears,
because the iodine is
reduced to the iodide ion,
which is colourless. At the
same time, the
thiosulphate is oxidized to
tetrathionate
III- Name of the acid radical : Thiosulphate
The anion is thiosulphate
The anion is thiosulphate
2Its symbol : S2O3