It's time to, in addition to doing math correctly, to use some logic. This will save you on an exam from making a horrible mistake while you try to do all the work in the allotted time.
Therefore, Gammagirl:, a pH of less than 1, quite possibly the strongest acid you've ever seen, is it plausible a dilute solution of an ionic salt will produce such a solution? What do you get from a 0.100 M NaCl solution? You have that solid in your home, correct? Can you dissolve your aluminum cookware with table salt?