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3 years ago

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What happens to a gummy bear when soaking in water?

1 answer:

nordsb [41]3 years ago

8 0

It gets huge. REALLY BIG....and tastes like jello....

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The pH of a solution of propanoic acid is measured to be . Calculate the acid dissociation constant of propanoic acid. Round you

Genrish500 [490]

The given question is incomplete. The complete question is:

The pH of a 0.98 M solution of propanoic acid is measured to be 2.43. Calculate the acid dissociation constant of propanoic acid. Round your answer to two significant digits.

Answer: The acid dissociation constant of propanoic acid is $1.4\times 10^{-5}$

Explanation:

$CH_3CH_2COOH\rightarrow CH_3CH_2COO^-+H^+$

cM 0 0

$c-c\alpha$ $c\alpha$ $c\alpha$

So dissociation constant will be:

$K_a=\frac{(c\alpha)^{2}}{c-c\alpha}$

Give c= 0.98 M and pH = 2.43

$pH=-log[H^+]$

$2.43=-log[c\times \alpha]$

$2.43=-log[0.98\times \alpha]$

$3.72\times 10^{-3}=0.98\times \alpha$

$\alpha=3.79\times 10^{-3}$

$K_a=\frac{(0.98\times 3.79\times 10^{-3})^2}{(0.98-0.98\times 3.79\times 10^{-3})}=1.4\times 10^{-5}$

The acid dissociation constant of propanoic acid is $1.4\times 10^{-5}$

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3 years ago