Chemistry, 29.11.2019 07:31, tobywaffle1234
Asolution is prepared at 25 °c that is initially 0.23 m in propanoic acid, a weak acid with k, = 1.3 x 10^-5, and 0.42 m in sodium propanoate. calculate the ph of the solution. round your answer to 2 decimal places.
Answers: 2
![\begin{array}{rcl}\text{pH} & = & \text{pK}_{\text{a}} + \log \left(\dfrac{[\text{A}^{-}]}{\text{[HA]}}\right )\\\\& = & 4.89 +\log \left(\dfrac{0.42}{0.23}\right )\\\\& = & 4.89 + \log1.83 \\& = & 4.89 +0.261\\& = & 5.15\\\end{array}\\\text{The pH of the buffer is $\large \boxed{\mathbf{5.15}}$}](/tpl/images/0395/8887/e0d2a.png)
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Asolution is prepared at 25 °c that is initially 0.23 m in propanoic acid, a weak acid with k, = 1.3...
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