Possible Deductions Based On The
Gas Evolved During Heating
|
Observations
|
Possible Deductions
|
| Carbon dioxide
produced. |
Carbonate is present.
But not Na2CO3 or K2CO3 because they are stable
to heat.
Organic compounds. |
| Ammonia produced. |
Ammonium salt is
present. |
| Only Oxygen is
produced. |
NaNO3 or KNO3 is
present.
Oxidising agents. |
| Oxygen and Nitrogen
dioxide are produced. |
All other metal
nitrates e.g. Ca(NO3)2 , Zn(NO3)2 , Pb(NO3)2 , Cu(NO3)2. |
| Sulphur dioxide |
All sulphites SO32-,
iron(II) sulphate |
| Colourless droplets
of liquid condensed on cool walls of test tube. |
Water droplets
is produced. Water of crystallisation from hydrated
crystals e.g. CuSO4.5H2O, FeSO4.7H2O, Na2CO3.10H2O
or water from thermal decomposition of metal hydroxides |
