Question: At what pH is [ H 2 PO 4 - ] = [ HPO 4 - 2 ] ? For H 3 PO 4 Ka

At what pH is [H2PO4-]=[HPO4-2]? For H3PO4 Ka1=7.11 x 10-3, Ka2=6.34 x 10-8, and Ka3=4.22 x 10-13.
7.20
12.38
2.15
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