[idunno289]

How do you calculate how much of an acidic solution, of a known percentage by weight, you need to create a solution of a desired pH, at a certain volume?



For example, how much muriatic acid (HCl 31.45% by weight) do you need to create 5 gallons (18.93L) of an acidic solution of pH 4?

I don't know which equations to use or where to even start.

[chenbeier]

1. Calculate the concentration in mol of H+  at pH in 1 l solution.
2. Calculate the amount for the 18.93 l
3. This concentration refairs to the HCl.
4. Calculate the mass of HCl.
5. Convert this to the 31.45%.
6. For the volume you need the specific gravity.