A buffer is prepared by dissolving 0.80 mol of sodium dihydrogenphosphate, NaH2PO4, and 0.60 mol of sodium hydrogenphosphate, Na2HPO4, in 500.0 mL of water. The Ka for the dihydrogenphosphate ion, H2PO4-, is 6.2 x 10-8 at 25 °C.  (note that we know both substances will dissociate in water to give Na+,  H2PO4- and HPO42- ,  the Na+ are spectator ions and the equilibrium reaction occuring in the buffer solution is    H2PO4-(aq)  + H2O(l)  ⇌⇌  HPO42-(aq) + H3O+(aq) ) What is the pH of the buffer produced?

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A buffer is prepared by dissolving 0.80 mol of sodium dihydrogenphosphate, NaH2PO4, and 0.60 mol of sodium hydrogenphosphate, Na2HPO4, in 500.0 mL of water. The Ka for the dihydrogenphosphate ion, H2PO4-, is 6.2 x 10-8 at 25 °C. 

(note that we know both substances will dissociate in water to give Na+,  H2PO4and HPO42- ,  the Na+ are spectator ions and the equilibrium reaction occuring in the buffer solution is   

H2PO4-(aq)  + H2O(l)  ⇌⇌  HPO42-(aq) + H3O+(aq) )

What is the pH of the buffer produced?  

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