what is the pH and pOH of a solution made by adding water to 15 grams of HCl until the volume of the solution is 2500mL?

Answer 1

mols HCl = grams/molar mass
Then M HCl =mols HCl/L HCl
M HCl = M (H^+)
Then pH = -log(H^+)
and pH + pOH = pKw = 14. You know pH and pKw, convert to pOH.