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OCR AS Planning Exercise 2008

For the sake of plagiarism/help/cheats whatever - this is just generally a question.

So we have Sulphuric acid and we show that it is dibasic, via a titration and via gas collection.

But now it comes to the specimen calculation. 'Show how the basicity of sulphuric acid would be worked out from the titration data'.

Upon first look, I showed that you need two moles of OH- to one mole of H2SO4. But upon looking again, I realised that I may have to find acid dissociation constants. However, I haven't come across pKa in the AS course.

To put it simply, how can you find the basicity of sulphuric acid from titration results? Because I haven't been taught that yet (if it is even taught at all).