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9 July, 18:23

A buffer solution is made using a weak acid, HA. If the pH of the buffer is 9 and the ratio of A - to HA is 100, what is the pKa of HA?

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  1. 9 July, 20:52
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    To calculate the pKa of the weak acid, we use the Henderson-Hasselbalch equation. It is expressed as pH = pKa - log [HA]/[A-]. This equation takes into account the concentration of the substance that does not dissociates into ions since it is a weak acid. We caculate as follows:

    pH = pKa - log [HA]/[A-]

    9 = pKa - log 1/100

    pKa = 7
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