What would be the pH of 0.568 g of HClO4 per 250 mL of solution?

Answer 1

HClO4 is a strong acid; i.e., it ionizes 100%. Therefore, (H^+) = (HClO4).
moles HClO4 = 0.568g/molar mass.
M = mols/L soln
pH = -log(H^+).