OPERIMU -
To
prepare colloidal solution (sol) of starch.
(2 APPARATUS
Deakers (250 ml and 50 ml), glass rod, funnel, flter-paper, and
Stand, wire-gauze and pestle mortar, po
burner.
MATERIALS REQURED
Soublestarch (1 g) and distilled water.
EIBORY
r e n loIms a lyophilic sol whe water is used as the dispersion medium. The forinaion
xS115 Itaccelerated by heating and the sol can be prepared by heating starch and water at aboit
100C. is quite stable and is not
affected by the presence of any electrolytic impiiy
PROCEDURE
Take.i g of starch in
a mortar and add few ml of distilled water.
Grind the starch to make a thin pásie and transfer this paste to à 50 it beaker:
Take about 125 mB of distilled water in a 250 ml beaker and heat the beaker so that
vaier starts boiling.
Pour tie paste slowly with
sirring into boiling water in the beaker (¥ig.
.
Continue boiling for about 2-3 minutes and then àallow the
Fiter the contents beaker to coo.
of the beaker througk a ilter-paper, fixed in a funnel. Label
iiirate Starch Sol'. th
Pasie of
stsrch
Glass
rod
Beaker
Wire
gauze
Tripod
stand
Burner
Tig. Preparation of starch sol.
PRECAUTIONS
1.The apparatus uaed for preparing sol shonld be properly cleared.
2. Distilled water should be used for
preparing sols in water
3. Starch should be converted into a fine paste before adding to boiling water.
4 . Starch paste should be added in a thin. stream to boiling water.
5: Constant stirring of the contents is necessary duriog he preparation of the sol.
RESULT
LyofAlli s ghrch ao fgarsas
To
prepare colloidal solution (sol) of starch.
(2 APPARATUS
Deakers (250 ml and 50 ml), glass rod, funnel, flter-paper, and
Stand, wire-gauze and pestle mortar, po
burner.
MATERIALS REQURED
Soublestarch (1 g) and distilled water.
EIBORY
r e n loIms a lyophilic sol whe water is used as the dispersion medium. The forinaion
xS115 Itaccelerated by heating and the sol can be prepared by heating starch and water at aboit
100C. is quite stable and is not
affected by the presence of any electrolytic impiiy
PROCEDURE
Take.i g of starch in
a mortar and add few ml of distilled water.
Grind the starch to make a thin pásie and transfer this paste to à 50 it beaker:
Take about 125 mB of distilled water in a 250 ml beaker and heat the beaker so that
vaier starts boiling.
Pour tie paste slowly with
sirring into boiling water in the beaker (¥ig.
.
Continue boiling for about 2-3 minutes and then àallow the
Fiter the contents beaker to coo.
of the beaker througk a ilter-paper, fixed in a funnel. Label
iiirate Starch Sol'. th
Pasie of
stsrch
Glass
rod
Beaker
Wire
gauze
Tripod
stand
Burner
Tig. Preparation of starch sol.
PRECAUTIONS
1.The apparatus uaed for preparing sol shonld be properly cleared.
2. Distilled water should be used for
preparing sols in water
3. Starch should be converted into a fine paste before adding to boiling water.
4 . Starch paste should be added in a thin. stream to boiling water.
5: Constant stirring of the contents is necessary duriog he preparation of the sol.
RESULT
LyofAlli s ghrch ao fgarsas
