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The effect of excess alkali on this molecule?

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AQA GCSE physics P1 unofficial mark scheme 05-05-2016
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    Hi, I've attached the diagram of the before addition of excess alkali and after (after is below the black line)

    I was wondering how do you know the alkali would only affect the OH and SO3H here?

    Why does it have no effect on NH2?
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    -SO3H groups are very acidic (think about H2SO3), similarly phenolic OHs are also acidic

    NH2 is a basic functionality and won't be effected


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