84 For preparing a buffer solution of pH = 70. which
buffer system you will choose?
A)H3PO4,H2PO4-, (B) H2PO4-, HPO4(2-)
C) HPO4(2-),PO4(3-) (D) H3PO4, PO4(3-)
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answer d is correct. h2p04 po4-3
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