`pH=1/2 pK_w -1/2pK_b -1/2 LOG C` `pH=1/2 pK_w +1/2 pK_a -1/2log C``pH=1/2 pK_w +1/2 pK_a +1/2 log C ``pH=1/2pK_w +1/2 pK_a -1/2 pK_b`
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