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How would you prepare a 500mL of 100mM phosphate buffer at pH 7.2 if you have...

How would you prepare a 500mL of 100mM phosphate buffer at pH 7.2 if you have only solid Na3PO4 and 1M HCL and 1M NaOH (may not use all reagents). Find mass of Na2HPO4, Volume 1M HCL, and Volume 1M NaOH

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