[Mahmoud Refaat]

Dears,

I know this is very obvious question to most, but i am stuck in it and i appreciate your help.

I have been researching on formulating products that yields a predictable dose of oPO4, for example :

Having a product with 11% Phosphoric acid (85%), Should yield 9.1 ppm oPO4 , at 100ppm Conc. of the product.

How is this calculated, and what are the factors that increase and decrease the dissociation of phosphoric acid into oPO4?

[Borek]

No idea what you mean, this is quite ambiguous. Please elaborate.

What do you mean by oPO4? (No, calling it orthophosphate doesn't clarify anything).