50007

Sodium carbonate determination  

September 17, 2008

do you have an analysis for troubleshooting carbonates in a Cadmium plating tank ???

Diane Brady
Plating /Analysis Tech - Baltimore, MD, USA

Diane,
Pipette a 10ml sample into a 600ml sqat form beaker, add 300mls of de-ionised water and heat on a hot-plate with a boiling rod XX DO NOT BOIL XX.
Add 10% Barium Chloride solution until no more precipitate forms then filter through a Whatman 40 filter paper. Wash the filter paper and beaker thoroughly with hot de-ionised water until the final washing no longer turns pH indicator paper blue. Transfer the filter paper back to the original beaker, pulp up the filter paper and add 200mls of de-ionised water and a few drops of Methyl Orange indicator.
Titrate with 1.0N Hydrochloric Acid while stirring the pulped paper with the boiling rod.
End-point is Orange TO red
Calculation is Titre mls 1.0N Hydrochloric Acid x 5.3 = g/l Sodium Carbonate

Good luck and hope this helps!

Nigel Gill, BSc MIMF MRSC
- Glasgow, Scotland