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BlackZzzverrR [31]
4 years ago
12

How many grams are in 0.21mol sample of ethyl alcohol?

Chemistry
1 answer:
vampirchik [111]4 years ago
7 0
Mass = moles x molar mass
Molar mass of eythl alcohol = 46

Mass= 0.21 x 46= 9.66g
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Choose specific acid-base conjugate pairs to make the following buffers: (a) pH ≈ 3.5;
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Our \ goal \ here\  is \ to \ find \ an \ acid-base \ conjugate \ pair \ that \ have \a \\\$pK_a-p H$. This is because we assume that the acid-base conjugate pair have an equal concentration to be considered an effective buffer.

$$p H-p K_a+\log \frac{\left[A^{-}\right]}{[H A]}$$

$$Where $\left[A^{-}\right]-[H A]$, so $\log \frac{\left[A^{-}\right]}{[H A]}-\log 1-0_{\text {so ... }}$$$

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$\mathrm{HOCH}_2 \mathrm{CH}(\mathrm{OH}) \mathrm{COOH} / \mathrm{HOCH}_2 \mathrm{CH}(\mathrm{OH}) \mathrm{COO}^{-}$with a $\mathrm{K}_{\mathrm{a}}-2.9 \times 10^{-4}$, and

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$$\begin{aligned}p K_w &-p K_b+p K_a \\p K_b &-p K_w-p K_a \\&-14-3.5 \\p K_b &-10.5 \\p K_b &--\log K_b \\K_b &-10^{-p K_b} \\&-10^{-10.5} \\K_b &-3.2 \times 10^{-11}\end{aligned}$$

There \ are\  no \ pairs \ near \  this \  $K_b$ value.

<h3>What is a conjugate acid and base pair?</h3>

An acid-base pair that differs by one proton is referred to as a conjugate pair. A conjugate acid-base pair is a pair of substances that can both absorb and donate hydrogen ions to one another. A proton is added to the compound to create the conjugate acid, and a proton is taken out to create the conjugate base. When a proton is supplied to a base, a conjugate acid is created, and vice versa when a proton is taken away from an acid, a conjugate base is created.

To learn more about conjugate acid and base pair, visit;

brainly.com/question/10468518

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