Limit test for sulphate

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BACKGROUND

The reagent used in the limit test for sulphate is barium sulphate and the comparison is done by observing turbidity of the test and standard solution, the soluble sulphate ion reacts with the barium chloride to form a white ppt as barium sulphate in the presence of dilute HCl. Barium sulphate reagent contains barium chloride, alcohol and potassium sulphate in small amount. Alcohol prevents supersaturation while potassium sulphate increases the sensitivity of the test by giving the concn. just exceeds the solubility product of barium sulphate.1

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Aim: Aim of this experiment is to carry out the limit tests for sulphate of the given samples.

REQUIREMENTS

Apparatus:

       Nessler’s cylinder,

       Glass Rod,

       Analytical balance

Sample:     

       Borax,

       Dextrose,

       Calcium gluconate,

       Citric acid etc

Chemicals:

       Dilute HCl,

       BaSO4,

       K2SO4 (potassium sulphate),

       Distilled water

PROCEDURE

The method for carrying out limit test for chloride requires; a standard and a test solution

Preparation of test solution

1gm of specified substance was taken and dissolved in distilled water,followed by addition of 2ml of dil.HCl then volume was made upto 45ml with distilled water. Atlast, addition 5ml of barium sulphate reagent was done with continuous stirring and kept untouched for 5mins.

Reaction

Preparation of standard solution

1ml of 0.1089% w/v of pot.sulphate was taken in a clean nessler’s cylinder to which few ml of distilled water and 2ml of dil.HCl were added.2 Then the volume was made upto 45ml with distilled water and barium sulphate 5ml was added at last, after which it was kept still for 5mins.

Reaction:1

CONCLUSION

After performing the above test, it was observed that the samples are of pharmaceutical mark as the opalescence of the test samples are lesser tan tat of standard solution.

REFERENCES

  1. Chatwal GR. Pharmaceutical inorganic chemistry (vol- 1); 2016.
  2. Indian pharmacopoeia; 2016.

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