I'm not sure what exactly ...
Published by Moslem Salesi Mousaabadi, Industrial water consultant at Mohafez Shimi
I'm not sure what exactly you are looking for but if you want to calculate the amount of acid you might need, you can use some applications or websites that calculate it for you. you just add the parameters and the amount of water and it'll give you an answer. but because there are some other parameters involve, you must monitor it yourself too.
by the way, often for cooling towers the optimum range is 7.8 - 8.3