Home /
Search 🔍
the Site
pub Where the world gathers for
plating, anodizing, & finishing Q&As since 1989

"Boric acid analysis method"



Q. I just want anybody help to analyze boric acid, but I need a single but exact method. I will be appreciated if anybody can help.

Thanks a lot,

Carlos Antonio
- Guatemala


A. Give a little more info. What kind of solution do you need to analyze?

Greg Conti
- Chino Hills, California, USA


A. The method commonly used is as follows: (for Nickel baths) pipette 2 mls of solution into 250 flask add 2-3 drops bromocresol purple titrate with a few drops of 0.1 N NaOH until solution turns blue add 5-6 grams solid mannitol, this will turn back to green color titrate with 0.1 N NaOH until blue. boric, oz/gal= mls of 0.1 N NaOH X 0.412

Jenn Wright
- Dayton, Ohio


A. This has been well covered in 15586.

trevor crichton
Trevor Crichton
R&D practical scientist
Chesham, Bucks, UK

August 28, 2012

Q. I would like to know the role of manitol or sarbitol in the boric acid analysis

Porchezhiyan Vedapuri
analyst - Cheyyar, Tamilnadu, India

August 29, 2012

A. The mannitol or sorbitol (I have also seen methods where glycerol is added) forms some kind of complex that increases the acidity of the H3BO3. Otherwise, you couldn't titrate it directly.

dave wichern
Dave Wichern
Consultant - The Bronx, New York

August 30, 2012

A. Dear Mr. Porchezhiyan,

Boric acid reacts with mannitol, xylitol or sorbitol forming a complex with borate, stabilizing the negative charge and increasing the strength of the acid.

This is because boric is a acid so weak that it cannot be measured by visual titration unless the strength is increased somehow.

Hope this can help you solving your issue! Regards,

Daniel Montañés
fasteners manufacturer - Cañuelas, Buenos Aires, Argentina

September 20, 2012

Q. Can anyone guide me to the "methods of analysis for quality control of boric acid?" I am seeking to get a homemade product registered with the Belize Pesticide Control Board... and the application requires this data. Any help and guidance would be most appreciated!

Denise Frank
- Belize City, Belize

finishing.com is made possible by ...
this text gets replaced with bannerText
spacer gets replaced with bannerImages

(No "dead threads" here! If this page isn't currently on the Hotline your Q, A, or Comment will restore it)

Q, A, or Comment on THIS thread -or- Start a NEW Thread

Disclaimer: It's not possible to fully diagnose a finishing problem or the hazards of an operation via these pages. All information presented is for general reference and does not represent a professional opinion nor the policy of an author's employer. The internet is largely anonymous & unvetted; some names may be fictitious and some recommendations might be harmful.

If you are seeking a product or service related to metal finishing, please check these Directories:

Chemicals &
Consult'g, Train'g
& Software

About/Contact    -    Privacy Policy    -    ©1995-2023 finishing.com, Pine Beach, New Jersey, USA