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(1) when ranking the acidity level (how strong the acids are), a low pKa means high acidity. Why is that? (2) Calculate the phosphoric acid

(1) when ranking the acidity level (how strong the acids are), a low pKa means high acidity. Why is that?

(2) Calculate the phosphoric acid solution pH when the ratio of [H₂PO₄^-]/[H₃PO₄] is 0.8.

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