Describe the preparation of 2 L of 85 mM phosphate buffer, pH 6.5, using 120 mM NaH₂PO4-6H₂O and 120 mM Na₂HPO4-6H₂O. The pka of the weak acid component is 7.21. Show calculations - uneah.. Molar masses of some elements. ELEMENT Na H P MOLAR MASS, g/mol 22.99 1.008 30.97 16.00 35.45

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