Chemistry: Assume that for the pH 9.2 phenolphthalein sample, you used half as much phenolphthalein solution (i.e your sample is 9 ml buffer, 0.5 ml phenophthalein solution and 0.5 ml water). what should happen to the value of Kc you determine?

Assume that for the pH 9.2 phenolphthalein sample,

Ответ:

offensiveneedle

20.01.2022

Chemistry

Explanation:

It is given that pH is equal to 9.2. So, we will calculate the value of $pK_{a}$ as follows.

pH = $pK_{a} + log \frac{[H_{3}O^{+}]}{[\text{solution}]}$

Putting the given values into the above formula as follows.

pH = $pK_{a} + log \frac{[H_{3}O^{+}]}{[\text{solution}]}$

$pK_{a} = pH - log \frac{\frac{1}{0.5}}{\frac{1}{10}}$

= 7.9

$K_{a} = 10^{7.9}$

= $1.26 \times 10^{-8}$

Since, the value of $K_{a}$ comes out to be positive. This means that there will occur an increase in the value of $K_{a}$ or $K_{c}$ .

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Ответ:

ciarrap552

19.06.2020

Chemistry

Imagine a chemist is in the lab and trying to make some chemical reactions happen. In one reaction she reacts chemicals in an exothermic reaction and there is an increase in entropy. A second chemical reaction she is trying to run is endothermic and there is a decrease in entropy. Which of the two reactions is more likely to occur and why?

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Assume that for the pH 9.2 phenolphthalein sample, you used half as much phenolphthalein solution (i.e your sample is 9 ml buffer, 0.5 ml phenophthalein solution and 0.5 ml water). what should happen to the value of Kc you determine?

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