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ThePotato381
02.11.2019 •
Chemistry
Trichloroacetic acid (ccl3co2h) is a corrosive acid that is used to precipitate proteins. the ph of a 0.050-m solution of trichloroacetic acid is the same as the ph of a 0.040-m hclo4 solution. calculate ka for trichloroacetic acid.
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Ответ:
Ka = 0.16
Explanation:
HClO₄ is a strong acid and it will dissociate completely to give hydrogen ion and the conjugate base.
The pH of HClO₄ will be calculated as:
pH = -log[H⁺]
pH = -log[0.04] = 1.4
The trichloroacetic acid is a weak acid and it will not dissociate completely.
The dissociation will be:
Initial 0.05 0 0
Change -x +x +x
Equilibrium 0.05-x x x
Ka =![\frac{[H^{+}][ClO_{4}^{-}]}{[HClO_{4}]}](/tpl/images/0356/4769/5addd.png)
As pH of the acid = 1.4 it means the concentration of hydrogen ion is 0.04.
Therefore
x = 0.04
Putting values
Ka =![\frac{(0.04)(0.04)}{0.05-0.04}=0.16](/tpl/images/0356/4769/91031.png)
Ответ:
[Ar] 4s2, 3d3
Explanation:
This is due to the loss of electeon, hence more proton.