Experiment No. 7 Swelling power of Bentonite

 

Aim: To determine the swelling power of Bentonite

Reference: Indian Pharmacopoeia 2010 vol II, page no 877.

Requirements:

Chemicals & Reagents: Bentonite, 1% sodium lauryl sulphate solution

Glassware: Measuring cylinder, beaker

Description: Bentonite is a natural, colloidal, hydrated aluminium silicate that has been processed to remove grit and non-swelling components of the ore. A very fine, pale buff or cream-coloured to greyish-white powder, free or almost free from gritty particles.

Category: Pharmaceutical aid (suspending agent)

Procedure: Add 2.0 g of bentonite in 20 portions at intervals of 2 minutes to 100 ml of a 1 per cent w/v solution of sodium lauryl sulphate in a 100 ml graduated cylinder about 3 cm in diameter. Allow each portion to settle before adding the next and let it stand for 2 hours.

Observation table:


Sr. No

Time

Volume of sediment (ml)

1

After 1 hour

 

2

After 2 hours

 

 

Result: The apparent volume of the sediment at the bottom of the cylinder is not less than 24 ml.

Conclusion: The given bentonite sample passes/fail the test for purity as per I.P 2010.

Youtube Video - Swelling Power (Index) of Bentonite

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