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We have an unknown acid or base solution, and 0.2M NaOH and HCl.How do i determine if the unknown is an A or B?

A and B being acid and base (couldnt fit it all in the title). The lab does not mention anything about using idicators, so it would be great if someone knew how to do it without using indicators, but anything is appreciated as im desperate!

Also, seems as NaOH and HCl are strong acids/bases, what if the unknown solution is a strong acid/base aswell? wont that just neutralise the solution (and even if we were allowed to use indicators, it wouldnt change colour would it?)

Thanks in advance :)

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