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can someone help me with this question??!(chemistry)

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Why bother with a post grad course - waste of time? 17-10-2016
    • Thread Starter

    45cm3 of 0.2M sodium hydroxide (NaOH) just reacts with 10cm3 of 0.3M phosphoric acid. Use this data to show that the formula of phosphoric acid is H3PO4?

    Source - http://www.thestudentroom.co.uk/show....php?t=2511299

    By genericusername1
    For the second one you just calculate the number of moles of phosphoric acid and NaOH
    You will find that there are 3 times LESS moles of phosphoric acid
    This means phosphoric acid must be able to donate 3 protons (have 3 hydrogen atoms)
    This gives you the H3 bit and since PO4 gives a 3- charge then it must be H3PO4
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