finishing.com -- The Home Page of the Finishing Industry
23+ years of serious education, promoting Aloha,
& the most fun you can have in metal finishing smiley
    no popups, no spam
HomeFAQsSuggested
Books
Help
Wanteds
Advertise
on this site
FORUM
current topics
topic 8824

Methods of analyses


(2001)

I am looking for a method for analyses to NaOCl,if you know any method please tell me.

Paulo SÈrgio Martins Alvares
- Londrina, Pr, Brazil


(2001)

Senhor Martins Alvares,

You should dissolve 0.5 g of soluble starch in 5 ml of cold demi water and add 95 ml of boiling water (add 0.1 soln of salicilic acid as preserver). As titrating agent you should use Sodium Thiosulphate 0.1 N. 25 ml of NaOCl are diluted to 1000 ml. 25 ml of this solution are put in a 250 ml flask, containing 50 ml of water, 20 ml of KJ (Potassium iodide) 10% and 10 ml of conc. Acetic acid (keep the 25 ml pipette tip slightly immerse into the solution). Titration follows: when solution colour changes from dark brown to light yellow, add 1 ml of starch solution. Titration ends when the blue colour disappears.

Results

Active Chlorine (g Cl/litre) =
(ml thiosulphate*0.1*35.46)/0.625 where 0.625 is the actual NaOCl employed

Best regards

Francesco Cicchetti
Francesco Cicchetti
- Sulmona, Italy



This public forum has 60,000 threads. If you have a question in mind which seems off topic to this thread, you might prefer to Search the Site

ADD a Comment to THIS thread START a NEW threadView CURRENT TOPICS



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


©1995-2018 finishing.com, Inc., Pine Beach, NJ   -   About finishing.com   -  Privacy Policy
How Google uses data when you visit this site.