Chemistry, 05.08.2019 22:20 weridness80

For the titration of a weak acid with a strong base what is the pka of the weak acid if the ph is 6.72 at the equilvalence point (100% t), 9.12 at the end point, and 4.23 at 50% t? answer with one sig fig.

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Answer from: jaylenmiller437

Explanation:

We have to calculate $pK_{a}$ value.

It is known that at the equivalence point concentration of acid is equal to the concentration of anion formed.

Hence, [HA] = $[A^{-}]$

Now, relation between $pK_{a}$ and pH is as follows.

pH = $pK_{a} + log \frac{[A^{-}]}{[HA]}$

Putting the values into the above formula as follows.

pH = $pK_{a} + log \frac{[A^{-}]}{[HA]}$

4.23 = $pK_{a} + log (1)$ (as [HA] = $[A^{-}]$ )

$pK_{a}$ = 4.23 (as log (1) = 0)

or, $pK_{a}$ = 4

Thus, we can conclude that $pK_{a}$ of given weak acid is 4.

For the titration of a weak acid with a strong base what is the pka of the weak acid if the ph is 6.

Answer from: Quest

The answer to your question really depends on three things: how much water you have, how cold it is to start out, and how cold the things around it are. water actually freezes when it gets to 32 degrees fahrenheit (0 degrees celsius), but the time it takes to get there may be different. let's start with the first. if you take two glasses, and fill one with a tiny bit of water, and the other about halfway, then put them both in the freezer, the one with less water will freeze first (you can try this at home, but i recommend using plastic cups and not glass ones). now let's move on to the second part. let's say you have two glasses, and you fill one with really cold water that has been in the refrigerator, and the other with really hot water from the sink. if you put both of them in the freezer, the one that started out colder will freeze first. for the third part, let's imagine that you have two glasses with the same amount of water in them, and the water is at the same temperature. imagine putting one outside on a really really cold day in georgia, and having a friend in alaska put one outside on the same day. since it would be so much colder in alaska, the glass of water there would freeze before yours. so, if you took a tiny bit of really cold water in a glass, and put it outside on a cold day in alaska, it would freeze a lot faster than a big glass of hot water outside on a cold day in georgia.

Answer from: Quest

Yeah, but what are you trying to ask?

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