Answers: 2
![pH=pK_a+\log\frac{[A^-]}{[HA]}](/tpl/images/1240/9315/3493b.png)
is the concentration of ![[H^+]](/tpl/images/1240/9315/07acb.png)
is the acid dissociation constant,
and 
are concentrations of the conjugate base and starting acid.
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