I have found something incorrect with Conc. Phosphoric Acid....
The Bottles contain 85% Phosphoric Acid, no doubt this gives the Acid a Concentration of 15 moles per Liter, (M). But when you look at this further and conduct a titrimetric Analysis based on this, the acid has a very deceiving property.
The Acid id triprotic which means there will be a tripple end point to the acids titration. But only the first two endpoints are detectable. If you are experienced then the third is very apparent.
I have further analysed this at University and have discovered that the tripple end point is very present.
I have asked if my PhD can be fast tracked due to this discovery but only to no avail!!! But careful consideration will be used when I have completed my thesis.
This is the confusing bit as far as phosphoric acid goes,
The Third end point is only present to those people experienced in the use and analysis of this acid due to the third end point being very hard to detect. THIS IS WHY THE 85% LABEL STATES THE CONCENTRATION OF THE PHOSPHORIC ACID AS BEING ONLY 15M.
Where realistically the acid should be slightly more.....
For normal use in schools the acid is close enough to the truth.
Many of my colleagues still in Industry could not believe my findings.
So continue on using the acid knowing that the concentration is not necessarily correct. The manufacturers only quote 15M due to the third endpoint being extremely hard to find and close to the second. “Enough for them to have a good point of argumentâ€Â.
Sorry to add to the confusion but as you all will appreciate the trouble I had when it had come to my analysis at Uni with the triprotic acid, until I had found this problem.
If any one would like to see my chemical formula of Phosphoric Acid undergoing the disassociation three times send a Private message to me and I will fax one off to you, it will be a set of three reactions displayed in Microsoft Word 2003 or 2007..
Very interesting find isn't it..
Cheers,
Robb.....
