Limit Test for Chloride- Principle, Procedure & Observation| P.I.C.| B.Pharma. 1st sem|Pharma Hub +

Описание: Hello guys
Welcome to the channel
I'm Krishna Agrahari and I'll be discussing about limit test.

Limit test -
This is a quantitative or semi quantitative test designed for identification and control of impurities present in the compound.

In limit test we compare test sample and standard sample & observe them.

There are 6 limit tests in your syllabus which is to be studied & performed.
These are -
1. Limit test for Chloride
2. Limit test for Sulphate
3. Limit test for iron
4. Limit test for lead
5. Limit test for arsenic
6. Limit test for heavy metals

In this video we are going to study about Limit test for chloride.

Principle
Limit test of chloride is based on the reaction of soluble chloride with silver nitrate in presence of dilute nitric acid to form silver chloride, which appears as solid particles (Opalescence) in the solution.

Requirements -
Reagents
dil. nitric acid (10%)
silver nitrate (5%)
std. sodium chloride solution

Apparatus
nessler cylinder
glass rod

Procedure
1. For test sample
Dissolve the specified quantity of the substance in distilled water and transfer it to the Nessler cylinder.
  - Add 10 ml of dilute HNO3.  
Make up the volume up to 50 ml.
Add 1 ml of silver nitrate solution.
Stir with glass rod immediately and keep aside for some time.

2. For standard sample
Place 1 ml of 0.05845% of NaCl solution in nessler cylinder
Add 10 ml of dilute HNO3.
Make up the volume up to 50 ml.
Add 1 ml of silver nitrate solution.
stir with glass rod and keep aside for some time.

Compare both cylinders after 5 minutes.

If the opalescence produced in sample is less than that of the standard , the sample will pass the test or vice versa.

Thank you for watching
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