Estimate Sulphate in Potassium Sulphate Using Gravimetric Analysis

APPARATUS REQUIRED:

1) Beaker

2) Watman no.42 filter paper 

3) Funnel

4) Gusible 

CHEMICAL REQUIRED:

1)  2 ml HCL

2) 1 ml K₂SO₄

THEORY:

The sulphate ion is precipitated as BaSO₄ by adding BaCL₂ solution.From the weight of BaSO₄, amount SO₄^— is calculated eg:     

PROCEDURE:

  1 ml of K₂SO₄ and 2 ml of HCL was taken in a beaker & it was heated nearly to boiling. Then Bacl₂ was added into the solution of sulphate with constant stirring. Then the precipitate was formed which was written. Then, the precipitate was washed with hot water by using filler paper. Then it was kept in gusible along with the filter paper & it was ignited.

CALCULATION:

            Wt. of empty gusible(a) = 23.2gm

            Wt. of crusible substance (b) = 23.7gm

            Wt of substance = b-a = 23.7-23.3 = 0.5 gm 

             Wt of substance = Wt. of BaSO₄

             233.36 gm of BaSO₄ contains 96gm of S0₄^—

             1 gm of BaSO₄ contains 96/233.36 gm of SO₄^—

            0.5 gm of BaSO₄ contains 0.205 gm of SO₄^—

RESULT:

 Hence, 0.205 gm of sulphate was present in the given solution of potassium sulphate.

CONCLUSION:

Hence, the amount of sulphate in the given solution of potassium sulphate by gravimetrically.

PRECAUTION:

1) Glassware should be handled carefully.

2) Weight should be noted carefully.