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What is the pH of a mixture of 0.042 M NaH 2 PO 4 and 0.058 M Na 2 HPO 4 ? ( Hint :

What is the pH of a mixture of 0.042 M NaH₂PO₄ and 0.058 M Na₂HPO₄? (Hint: the relevant pKa value here is 6.86).

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