Summary for sodium sulphate analysis Discussion
The thread asks for a simple way to analyze sodium sulphate in a pickling-bath neutralizing solution and report it in g/L. Dr. Thomas H. Cook first suggests a classic precipitation titration: titrate a known volume of the sodium sulphate solution with standard barium chloride using chromate as the indicator, stirring continuously until the white precipitate changes to a brick-red barium chromate endpoint. When asked for the calculation, the discussion later adds a different method from Bhupesh Mulik: dissolve the sample in acetone, add dithizone indicator and ammonia buffer, then titrate with lead nitrate to a rose-blue endpoint. Because the thread contains two different analytical approaches, the practical takeaway is to follow the method that matches the lab’s reagents and validation, and use the stoichiometry of the chosen titration to convert the titrant volume into g/L sodium sulphate.
HI
I AM P.L.PAHWA FROM HISAR AND I AM WORKING WITH M/S JINDAL STAINLESS STEEL LIMITED. I AM WORKING IN QUALITY CONTROL LABORATORY.HERE IS A PICKLING LINE FOR REMOVE THE SCALE AND DURT FROM THE SURFACE OF STAINLESS STEEL STRIP.WE ARE USING ONE TANK OF HNO3+HF(12%+1%) AND SECOND TANK OF H2SO4(10%)AND THIRD ONE OF SODIUM SULPHATE AS NEUTRLIES THE ACID STAINS.WE ARE RECEVING SAMPLE FROM PICKLING LINE FOR ANALYSIS OF SODIUL SULPHATE IN GMS/LITE IN THE GIVEN SAMPLE.PLEASE GUIDE ME HOW I CAN TEST THE SAME BY SOME SIMPLE TITRATION METHOD.
POORAN LAL PAHWA
JINDAL STAINLESS STEEL,HISAR- HISAR(Haryana), INDIA
2005
2005
You can titrate a known volume of your sodium sulphate solution using a standard barium chloride solution (toxic) using chromate as indicator. You will have to continuously stir the solution and when the white barium chloride turns to a brick red barium chromate precipitate the end point is reached.
Regards,
Dr. Thomas H. Cook
Galvanizing Consultant – Hot Springs, South Dakota, USA
Q.
Dear Dr. Thomas H. Cook ,
You have written the following for titration of Na2SO4 and BaCl2,Please provide us the calculation of Na2SO4 in Gm/Litre
You can titrate a known volume of your sodium sulphate solution using a standard barium chloride solution (toxic) using chromate as indicator. You will have to continuously stir the solution and when the white barium chloride turns to a brick red barium chromate precipitate the end point is reached.
Regards
R.K.Kushwah
R.K.Kushwah
– Angul, Orissa, India
November 11, 2012
A. First you take a sample and dissolve in acetone
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. Then add diathizone indicator; add ammonia
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Bhupesh Mulik
– Mumbai, India
November 20, 2012
adv.
