Prepare a 100 mM phosphate buffer solution (pH 6.5). The solutions used are NaH2PO4 and Na2HPO4 (1 M each). How can I go about this?

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Chapter1: Chemical Foundations
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Prepare a 100 mM phosphate buffer solution (pH 6.5). The solutions used are NaH2PO4 and Na2HPO4 (1 M each). How can I go about this?

Also, how to make stock solutions of catechol, one in buffer and one in water, each with a concentration of approximately 500 mg/L.

 

Thank you for your help in advance!

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