HClO4 = Perchloric acid (Strong Acid)
HClO4 will dissociate completely H+ and ClO4-.
[HClO4] = 0.25 M => [H+] = 0.25 M
pH = -log[H+]
pH = -log(0.25) = -(-0.60) = 0.60
( The pH of 0.25 M solution of HClO4 is 0.60 )
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