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What is the [H2PO4-] of a solution labeled "0.10 M Phosphoric Acid (H3PO4)"? [Ka1 = 7.1x10-3;...

What is the [H2PO4-] of a solution labeled "0.10 M Phosphoric Acid (H3PO4)"?
[Ka1 = 7.1x10-3; Ka2 = 6.3x10-8; Ka3 = 4.2x10-13]

A. 4.2x10-13 M

B. 2.7x10-2 M

C. 7.1x10-3 M

D. 1.6x10-9 M

E. 1.6x10-16 M

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