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I have the following system: small particles (I dont know exactly the composition) in a batch stilled tank reactor in which i add some hydrochloric acid.

How I evaluate the concentration of saturation of those particles into the bulk?

I am able to calculate the loss in volume vs time considering the total volume.

I practice if we consider the solid particles as "A" and "Ca" the concentration of A, then I want to evaluate [Ca(saturation)-Ca(at a time t)] i am able to calculate Ca(at a time t) but i am not sure about Ca(saturation).

I was thinking to consider Ca(saturation) as the concentration of all A dissolved into the bulk but I am not sure about it.

Thanks very much, you can also write me at: dinodeblasio@yahoo.it