CHEIMISTRY

A buffer solution is 0.20 M in HPO42- ions and 0.l0 M in H2PO4- ions. What is the H3O+ ion concentration of the solution? The ionization constants for H3PO4 are as follows: Ka1 = 7.5 ´ 10 -3, Ka2 = 6.2 ´ 10-8, Ka3 = 1 ´ 10-12.

a. 3.7 ´ 10-3 M
b. 3.7 ´ 10-4 M
c. 3.1 ´ 10-8 M
d. 3.1 ´ 10-9 M
e. 5 ´ 10-13 M

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