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What is the eqn for a buffer equilibrium of: H2PO4 ^(-) / HPO4^(2-) in human blood??? I got H2PO4 ^(-) + OH^(-) <--> HPO4 ^(2-) + H2O It's prob very very wrong. I honestly have no idea what the answer is

How do I work out the pH of a solution when it's basic ie has OH- rather than H+ ions floating around??? I know it has something to do with the number 14...