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Any other First Year I.T. students around here? Haven't seen any others around here, if there's any here, it'd be nice to get to know some of you. :)

I'm having trouble with the following question: A sulfuric acid solution has a concentration of 5 x 10^-4 mol L-1 What is the pH of the solution, assuming the acid is completely ionised? A)3.0 B)3.3 C)3.6 D)4.0 I calculated 3.3, but the Board of Studies has the answer as 3.0, so I...