What are the primary chemical components present in a phosphate buffer at pH 7.4?
A) H3PO4 and PO4−3
B) H2PO4− and PO4−3
C) HPO4-2 and PO4-3
D) H2PO4− and HPO4−2
E) H3PO4 and HPO4 −2
Correct Answer:
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