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Question 15 depends if you assume that the weak acid fully ionises or partially ionises. From the 2010 paper, there was a multiple choice question that assumed full ionisation of weak acids. Therefore, I assumed that the hsc expects you to say that weak acids fully ionises. Therefore, answer for...

Also, which type of filter paper should you use to filter the barium sulfate? I either have the choice of qualitative filter paper or ashless filter paper. And does ashless filter paper decompose with heat?

yes.... My chemistry teacher also says that water goes in from the top. I agree with my tutor that water goes in from the bottom. I also agree that my teacher should check her facts and use common sense because if water was to go in from the top, then it would quickly leak out the bottom.