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3 years ago

Four substances are tested for different properties. The results of the tests are in the table below.

Chemistry

2 answers:

Marta_Voda [28]3 years ago

7 0

Answer:

C.) Y

Explanation:

good luckk :))

ella [17]3 years ago

5 0

Answer:

Element Y, or the third option

Explanation:

Alkanes are insoluble in water, but soluble in ether. Their boiling points are pretty low, barely reaching 200 degrees, so element Y is an alkane.

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What is the pH of a 0.1 M phosphate buffer (pKa = 6.86) that contains equal amounts of acid and conjugate base?

Anvisha [2.4K]

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Explanation : Given,

$pK_a=6.86$

Concentration of acid = 0.1 M

Concentration of conjugate base (salt) = 0.1 M

Now we have to calculate the pH of buffer.

Using Henderson Hesselbach equation :

$pH=pK_a+\log \frac{[Salt]}{[Acid]}$

Now put all the given values in this expression, we get:

$pH=6.86+\log (\frac{0.1}{0.1})$

$pH=6.86$

Therefore, the pH of a 0.1 M phosphate buffer is, 6.86

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