Explain what is the ph of the na2hpo4 buffer

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A buffer is prepared by mixing 500 ml of 0.4 M Na2HPO4 with 500 ml of 0.2 M NaH2PO4. what is the pH of this buffer? What would be the final pH if you added the same quantity of acid to 1 litre of H2O (pH 7)?

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