finishing.com -- The Home Page of the Finishing Industry

HomeFAQsSuggested
Books
Help
Wanteds
Advertise
on this site
FORUM
current topics

World's most popular finishing site / Internet's friendliest corner

topic 8976

Sodium hydroxide analysis of alkaline zinc

A discussion started in 2001 but continuing through 2019

2001

Q. What indicator do you suggest I use for analysis of sodium hydroxide in alkaline non cyanide zincs? The one used at present is BDH 11-13 but this is no longer available.

Philip Gormley
plating services - Irvine ,Ayrshire, Scotland


2001

A. Try using Sulfo-orange or phenolpthalein. I use the sulfo-orange for cyanide based solutions. It might work. I use the phenolpthalein for alkaline cleaners.

I'm not at work until Tuesday, at which time, if you want I can try a couple of experiments and get back to you.

K. Gendron
- Trenton, ON, Canada


2001

A. 1. 5 ml. sample into a 250 ml. flask.

2. Add 25 ml. 20 % barium carbonate.

3. Add 3 drops phenolphthalein indicator.

4. Titrate with 0.1 N hydrochloric acid, color change is pink to white.

5. mls. titrated x 1.06 = oz/gal.

Bill Hemp
tech svc. w/ chemical supplier - Grand Rapids, Michigan


2001

A. In response to the NaOH Titration procedure of Alkaline Zinc At our shop we use 5 ml sample 20 ml water A few specks of Indigo Carmine Indicator Titrate with 1.0N HCl from yellow to blue mls titrated * 0.95 = OZ/GAL * 7.5 = gms/lt

Lee Moss
- Calgary, Alberta, CANADA


2001

A. We gave up on indicators and now use a pH meter and stirrer this gives more repeatable results. End point pH 11.2

Martin Trigg-Hogarth
Martin Trigg-Hogarth
surface treatment shop - Stroud, Glos, England


April 7, 2019

A. BDH 11-13 indicator is actually pretty easy to make yourself ... only 2 reagents needed
I have been making my own for years

Nigel Gill
Aerospace - Glasgow, Scotland


July 17, 2019

Q. And how can I make the BDH 11-13 indicator by myself?
Which reagents are needed?

Benjamin Buettner
- Newhouse, Thuringia, Germany


August 5, 2019

Q. Good morning,
I would like to know the recipe for the preparation of the BDH 11-13 that I used but, at the end of the product, I was no longer able to obtain it from my supplier who did it in his laboratory.
Paul from Torino Italia

Paolo Scialuga
Surfaces treatment - Torino Piemonte Italia


October 30, 2019

A. Hi Paolo,
The compound used in BDH 1113 indicator is 4-(4-Nitrophenylazo)resorcinol.
So, dissolve ~1% m/v in ethanol.
You can get 4-(4-Nitrophenylazo)resorcinol from Fisher Scientific.
Best Regards,

Mark Lees
aerospace - A not so warm rock in the irish sea

Q, A, or Comment on THIS thread SEARCH for Threads about ... My Topic Not Found: Start NEW Thread

Disclaimer: It's not possible to 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 may be deliberately harmful.

  If you need a product/service, please check these Directories:

JobshopsCapital Equip. & Install'nChemicals & Consumables Consult'g, Train'g, SoftwareEnvironmental ComplianceTesting Svcs. & Devices


©1995-2019 finishing.com, Inc., Pine Beach, NJ   -   About finishing.com   -  Privacy Policy
How Google uses data when you visit this site.