* * * * * * * * * ** * "
To prepare a colloidal sol offerric hýdrazide, [Pe(0), J.
**- ***. T
APPARATUS
Conical lásk (250 inl), beaker (250 ml), a boiling-tube, glass-rod, funnel, round-bottom
ilask, iron stànd with a clamp, wire gauze, tripod-stand, burner anda burette or a droppér.
MATERIALS REQUIRED
2To solution of ferric chloride (prepared by dissoving 2 g of pure PeCl, in 100-ml distilled
water) and distilled water
THEORY
Yerrnc
bydroxide is a yophobic sol. The substances s1ch as metal hydroxides or'sul
phides which are insolubie and do not readily give colloidal solutions on treatment with water
are called lyophobic colioids.
Perrnic hydroxide soB is prepared by the hydrolysis of ferric chlozide with boiling distilled
water. The reaction that takes
place can be represented as
Boil
FeCl,(eg) +3H,O0) FelOH,(6)+ 3HCag)
Perric chloride Red sol
"T'ne hydrolysis
reaction produces insolubie.ferric nydrcxide particies wcich niergo
agglomerisation to yieid bigger particles of colloidal dirmensions. These particies udsóvi
icns preferentially îrom the soluion to give positive charge to the sol particles, Siabilit oE tiue
soi is due io the charge on the so! particles. Hydrochloric acid uwhich is
produced auring hydroiyss
ries to descoilize the sol and hence it mus: be removed from the sol by diclysis proces othereis:
sol will nct oe stadie.
PROCEDURE
. Take a 250 ml conical ñask and ciean it by steaming-out process as showa in.
*
-
.To this cleaned Bast, add 100.al of istilled-vater and heai it to.boil isy yiaing the
flask on a wirsgauze.
2 Add íerric chioride solütion dropwise (by the use of a buretie or ä dropoer) ic tne
boiling water.
Continue heating until deep red or browz solution of feric hydroxide is obtained
Replace the water lest by evaporation dering beiing at regular intervals.
. Keep the contents oí conical ílask undisturzbed for sometime at roore tamperature.
Label the schuaion as "ferric hydroziie sol".
PRECAUTIONS
1. Since ferric hydroxide sol is-af+ected by impurities, the apparatus required for tihe
preparation of sol should be thoroughly cleaned by steaning-out process.
2. Add ferric chloride solution. dropwise.
i
3. Heatmg is contiiued till the desired so! is obtained.
Esver: A dyopkobsssdl s i a ydn.oy
6nepenuod
To prepare a colloidal sol offerric hýdrazide, [Pe(0), J.
**- ***. T
APPARATUS
Conical lásk (250 inl), beaker (250 ml), a boiling-tube, glass-rod, funnel, round-bottom
ilask, iron stànd with a clamp, wire gauze, tripod-stand, burner anda burette or a droppér.
MATERIALS REQUIRED
2To solution of ferric chloride (prepared by dissoving 2 g of pure PeCl, in 100-ml distilled
water) and distilled water
THEORY
Yerrnc
bydroxide is a yophobic sol. The substances s1ch as metal hydroxides or'sul
phides which are insolubie and do not readily give colloidal solutions on treatment with water
are called lyophobic colioids.
Perrnic hydroxide soB is prepared by the hydrolysis of ferric chlozide with boiling distilled
water. The reaction that takes
place can be represented as
Boil
FeCl,(eg) +3H,O0) FelOH,(6)+ 3HCag)
Perric chloride Red sol
"T'ne hydrolysis
reaction produces insolubie.ferric nydrcxide particies wcich niergo
agglomerisation to yieid bigger particles of colloidal dirmensions. These particies udsóvi
icns preferentially îrom the soluion to give positive charge to the sol particles, Siabilit oE tiue
soi is due io the charge on the so! particles. Hydrochloric acid uwhich is
produced auring hydroiyss
ries to descoilize the sol and hence it mus: be removed from the sol by diclysis proces othereis:
sol will nct oe stadie.
PROCEDURE
. Take a 250 ml conical ñask and ciean it by steaming-out process as showa in.
*
-
.To this cleaned Bast, add 100.al of istilled-vater and heai it to.boil isy yiaing the
flask on a wirsgauze.
2 Add íerric chioride solütion dropwise (by the use of a buretie or ä dropoer) ic tne
boiling water.
Continue heating until deep red or browz solution of feric hydroxide is obtained
Replace the water lest by evaporation dering beiing at regular intervals.
. Keep the contents oí conical ílask undisturzbed for sometime at roore tamperature.
Label the schuaion as "ferric hydroziie sol".
PRECAUTIONS
1. Since ferric hydroxide sol is-af+ected by impurities, the apparatus required for tihe
preparation of sol should be thoroughly cleaned by steaning-out process.
2. Add ferric chloride solution. dropwise.
i
3. Heatmg is contiiued till the desired so! is obtained.
Esver: A dyopkobsssdl s i a ydn.oy
6nepenuod
