Page 4 - Lab Manual & Project class 12

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To purify prepared sol by dialysis.

 

• Parchment/
• Colloidal dispersion of : Prepared in
cellophane paper : One sheet
egg albumin experiment 1.1
Maxbrain Chemistry
(30 cm × 30 cm)
• Distilled water : As per requirement
• Trough : One
• Uranyl zinc acetate : As per requirement
• Thread : As per need
• Silver nitrate : As per requirement
• Test tubes : Two


(i) Take a square sheet (30 cm × 30 cm) of parchment/
cellophane paper.
(ii) Soak the sheet in water and give it a conical shape.
(iii) Pour the colloidal dispersion of egg albumin in the cone of
parchment/cellophane paper.
(iv) Tie the cone with a thread and suspend it in a trough
containing distilled water as shown in Fig. 1.1.

Fig. 1.1 : Purification of a colloid

(v) After about half an hour, test for the presence of ions in the
trough water.

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24-04-2018