On the basis of the information above, a buffer with a pH = 9 can best be made by using A pure NaH2PO4

B H3PO4 + H2PO4–

C H2PO4– + PO42–

D H2PO4– + HPO42–

E HPO42– + PO43

Calculate the number of molecules present in 0.750 mol of mgo.

If an area has high air pressure and low humidity, what type of weather will it most likely have? plz !

Oil rich countries in the middle east cover about 4% of earths total land area but prossess about 48% of the worlds known oil reserves what is the main reason for high concentration of reserves in this part of the world