Answer to Question #290721 in Organic Chemistry for Esen

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 .