Chemistry, 14.09.2019 11:30 joelpimentel
Calculation: if you have a ph of 5.5 for a weak acid with a pka of 4.76, then is there more a- or more ha in the solution? explain why in words using your knowledge of positive or negative log numbers.
Answers: 2
![\begin{array}{rcl}\text{pH} &=& \text{pK}_{\text{a}} + \log\dfrac{[\text{A}^{-}]}{\text{[HA]}}\\\\5.5 & = & 4.76 + \log\dfrac{[\text{A}^{-}]}{\text{[HA]}}\\\\0.74 & = & \log\dfrac{[\text{A}^{-}]}{\text{[HA]}}\\\end{array}](/tpl/images/0231/3578/242fa.png)
![\begin{array}{rcl}\dfrac{[\text{A}^{-}]}{\text{[HA]}} & & 1\\\\\textbf{[A]}^{-} & & \textbf{[HA]}\\\end{array}](/tpl/images/0231/3578/d6e2f.png)
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Calculation: if you have a ph of 5.5 for a weak acid with a pka of 4.76, then is there more a- or m...
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