THEORY:
The solubility of a substance at a particular temperature is the amount of the substance in gm required to saturate 100 gm of water at that temperature.
Solubility= wt. of solute / wt. of solvent x100
APPARATUS :
1) Beaker 100 ml
2) Porcelain basin
3) Desiccator
4) Air oven.
CHEMICALS:
1) Given soluble solid
PROCEDURE:
a) Take about 20 ml of distilled water in a clean small beaker. Add small quantities of the powdered solid a little at a time with constant stirring till it forms a saturated solution at room temperature (a solution in which some solid remains undissolved.)
b) Now, weigh a small porcelain basin.
c) Filter the solution into the porcelain basin, and carefully weigh the basin along with the solution.
d) Evaporate the solution to dryness on a water bath when the solid will be found left in the basin.
e) Dry the basin with the solid residue in an air oven, cool it in a desiccator and weigh again.
f) Repeat the process of heating in the air oven, cooling and weighing till the final weight is constant.
g) Note the laboratory temperature.
CALCULATIONS :
Weight of the empty basin = a gm
Weight of basin + saturated solution = b gm
Weight of basin + solid residue = c gm
Therefore, Weight of solid dissolved = (c- a) gm
and weight of water = (b – c) gm
Therefore, Solubility of the given solid = (c – a) / (b – c) x100