Inorganic Chemistry (03) Limit Test for Chlorides | Chloride Limit Test | What is Limit Test

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Contents for 1st Unit of Inorganic Chemistry -
Impurities in pharmaceutical substances: History of
Pharmacopoeia, Sources and types of impurities, principles involved in the
limit test for Chloride, Sulphate, Iron, Arsenic, Lead and Heavy metals,
modified limit test for Chloride and Sulphate
LIMIT TESTS
1. LIMIT TEST FOR CHLORIDES
Apparatus Required
Nessler cylinders
Glass rod
Stand
Chemicals Required
Dilute Nitric acid (10%)
Silver nitrate (5%)
Sodium chloride
Principle
It is based upon the chemical reaction between silver nitrate and soluble chlorides in presence of dilute nitric acid to give opalescence of silver chloride. If the Opalescence produced is compared with the standard solution. If the opalescence in the sample is less than the standard, it passes the test. If it is more than the standard, it fails the test.
Procedure
Test sample
1.Specific weight of compound is dissolved in water or solution is prepared as directed in the pharmacopoeia and transferred in Nessler cylinder
2. Add 1ml of nitric acid
3. Dilute to 50ml in Nessler cylinder
4. Add 1ml of AgNO3 solution
5. Keep aside for 5 min
6. Observe the Opalescence/Turbidity
Standard compound
1. Take 1ml of 0.05845 % W/V solution of sodium chloride in Nessler cylinder
2. Add 1ml of nitric acid
3. Dilute to 50ml in Nessler cylinder
4. Add 1ml of AgNO3 solution
5. Keep aside for 5 min
6. Observe the Opalescence/Turbidity
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[@SachinYadav-ew7ig]

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[@GloryManthan]

Thank you mam

[@Kartik_Arya]

9:35 mam agar dono ka colour same hoga toh test fail hoga ya pass?

[@AnithaNambari-x5r]

Why we should we use dilute nitric acid why not acidic

[@SonuSharma-gu1rr]

What is role of nitric acid in chloride limit test

[@SonuSharma-gu1rr]

8.14 to check turbidity
To check the turbidity of white color, should a white or black background be taken?

[@izazinthyaz3620]

Why we use nitric acid in this test

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[@PayalGupta_Other_Side]

Ma'am How much nitric acid to take 1 ml or 10 ml?

[@_ayush_y_]

1ml nitric acid add hoga

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Sample solution me konse sample use karne hai

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Galat bata rhae ho test me sample me nacl nh lange

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Thank you mam

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Thanks you mam