Chemistry, 14.02.2020 17:26 danidavis2002
You have 50 ml of a complex mixture of weak acids that contains some HF (pKa = 3.18) and some HCN (pKa = 9.21). Which is larger, [F-]/[HF] or [CN-]/[HCN]?
Answers: 3
![\frac{[F^{-}]}{[HF]}](/tpl/images/0511/5531/fe465.png)
is larger
, where 
is the acid dissociation constant.![K_{a}=\frac{[H^{+}][A^{-}]}{[HA]}](/tpl/images/0511/5531/c814f.png)
and ![\frac{[A^{-}]}{[HA]}=\frac{K_{a}}{[H^{+}]}](/tpl/images/0511/5531/b8841.png)
![[H^{+}]](/tpl/images/0511/5531/85507.png)
will be constant.![(\frac{F^{-}}{[HF]}=\frac{K_{a}(HF)}{[H^{+}]})(\frac{CN^{-}}{[HCN]}=\frac{K_{a}(HCN)}{[H^{+}]})](/tpl/images/0511/5531/19b23.png)
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You have 50 ml of a complex mixture of weak acids that contains some HF (pKa = 3.18) and some HCN (p...
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