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If you have 3 unknown solutions, one an acid, one an alkali, and one is phenolphthale watch

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    If you have 3 unknown solutions, one a strong acid, one a strong alkali, and one is phenolphthalein how do you determine which is which? no ph tests or litmus paper etc...the only thing you have to work with are these three chemicals. I get you can mix them randomly and with phenolpthalein and the alkali it will turn pink but how would you then determine which is one of the two solutions was the phenolphthalein and which was the alkali

    Mix them. Find the two that go pink. Add the other one, i.e. the acid, it'll be colourless. Add one of the first two. (a) if you add phenolphthalein, nothing will happen (b) if you add alkali, it'll go pink again.
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