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I wish to know how to test free acidity of the bath  

June 21, 2008

Hello I'm working in a paint shop in Delhi. I know how to test and maintain total acidity of the bath but I'm unaware that how should I check the free acidity of my bath as im using chemicals of German based company?

Varun Kumar
paint shop employee - Delhi

Hi,

Can we please get more details on your question?

thanks

Terry Tomt
- Auburn, WA

What kind of acids are you using? It's hard to tell which method to use without knowing what you're looking for (different acids have different titration methods).

Jason Rothman
Chemist - Pomona, CA, USA

Sir,
The answer to your question is quite simple. As titrant you use a strong base (alkali). For total acidity (all the acid that you have added, use an indicator near neutral (e.g. phenylphalien). For "free" acid use an indicator that changes color perhaps between about 3 or 5.
Regards,

Dr. Thomas H. Cook
- Hot Springs, South Dakota, USA