Identifying acids, bases and buffers help

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    Hi, I have to plan a practical and I'm a bit stuck. I have 7 solutions which I know but need to find which one is which. They are some weak acids (methanoic, ethanoic) some strong acids, (hydrochloric, sulphuric), an ethanoate buffer and sodium hydroxide.
    So far all I have is putting them all in a pH probe haha to get initial pH. I know that weak acids have a ka which I have been given, but not sure what to do with it, seen as though I have strong acids too.
    Where can I go from here? I have a separate known concentration of NaOH and HCl which I can use to help find solutions, as well as phenolphthalein indicator. Thank you!!
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    React a sample of each with NaOH and HCl to see what is an acid and base?
    Use indicator to find pH / pKa from that?
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    (Original post by uncleleech)
    React a sample of each with NaOH and HCl to see what is an acid and base?
    Use indicator to find pH / pKa from that?
    The indicator will only work for a small range of pH no?
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    You could carry out titrations I guess.
 
 
 
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