Answer to Question #301760 in Organic Chemistry for Nana

Question

Calculate the amounts of solids Na2HPO4 and NaH2PO4 needed to prepare 0.40 M, 1.5L of phosphate buffer with pH of 7.0.

Answer 1

NaH₂PO₄ ( Acid ) + Na₂HPO₄ ( salt ) is a Buffer Solution

So,

P^H = P^ka + log salt / Acid .

If P^H = P^ka then Salt and Acid both have equal concentration that is equal moles .