The finishing.com Hotline -- Serious Education ... plus the most fun you can have in metal finishing
Analysis of Tin Plating Bath Solution
An ongoing discussion from 2004 through 2015 . . .(2004)
Q. Dear Sirs,
I am trying to find methods of analysis of a Tin Plating bath solution which consists of: Na2Sno3 3H2O =70 gr/l, NaOH= 11 gr/l,and lCH3COONa=22 gr/l. I have to determine the concentration of Tin Stannate (Na2SnO3 3H2O) (gr/l) and Free Sodium Hydroxide(NaOH)(gr/l)in the above solution. Please, suggest to me methods.
Thanking in advance,Fotini Kiriakou
Chemical Lab - Tanagra, Viotia, Greece
A. Dear friend,
You have to take 5 ml of bath solution add to it 5 ml conc. HCl and 5 ml starch indicator and titrate it against 0.1 N Iodine solution. Multiply B.R. by 1.187 you will get the GPL of Stannous.Onkar Kulkarni
- Pune, Maharashtra, India
Dear Onkar Kulkarni,
I use the method you suggest for the tin stannic salts but add a nickel catalyst to the tin and HCl and boil to a receiving vessel for 40 mins and titrate as your method. This is time consuming but does work; is your method comparable with mine? I will try you method out.
Many thanks,Ian Jones
Q. Dear friend
I would like to thank you for your response to the first part of my question, determination of Sodium Stannate. I would really appreciate if you or anybody else could give me a method for the second part of my question that is the determination of Free Sodium Hydroxide in the Tin Plating Solution Bath.
Thank you again,Fotini Kiriakou [returning]
- Tanagra, Viotia, Greace
A. Dear Fotini
mix 10 ml of vat sample with 50 ml Cl2Ba (10%) and few drops of thymolphtalein indicator. titrate with N hydrochloric acid to blue end point.
Titre x 4.00 =g/l free NaOH
PS:due to absorption of the indicator by precipitate, add few extra spot of indicator in half way point of titration.hadi khosravi
- tehran iran
Dear Hadi, thanks a lot for your response to my question. It will help me very much.
Have a good day.Fotini Kiriakou
- Tanagra, Greece
November 5, 2012 -- this entry appended to this thread by editor in lieu of spawning a duplicative thread
Q. How to do analysis for tin plating solution to find out tin metal, tin sulphate, sulphuric acid?Prajkta Tapare
student - Ahmednagar, India
April 14, 2015
Q. Dear sir,
What is meant by 10 Vat sample in the free alkali test you had mentioned. Please suggest; I am waiting for your response.
- Thane, Maharashtra, Indian
A. Hi Manesh. Hadi surely means a 10 ml sample from the tank of tin plating solution which you wish to analyze. Best of luck with it.
Ted Mooney, P.E. RET
Pine Beach, New Jersey