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How can I identify these 4 solutions?

4 pipets contain solutions of Ba(NO3)2, H2SO4, HNO3, and NaOH, although not necessarily in that order. Devise and carry out an experiment to identify the contents of the four pipets and determine the concentration of both acids. The molarity of the NaOH solution is 0.50M.

Please help me? Don't tell me the answers, but at least show me what I'm supposed to do. How do I identify these 4 solutions? I know it has something to do with solubility rules, but I'm just confused

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