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A phosphate buffer is involved in the formation of urine. The developing urine contains H2PO4- and HPO42- in the same concentration as present in blood plasma.
a. Identify the acid and its conjugate base.
b. Write the ionization equation and the Ka expression.
c. The Ka of H2PO4- is 6.2 x 10-8. What is the pKa?
d. Is this acid (H2PO4-) weaker or stronger than H2CO3?
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