C Chegg Study Guided ScA ALEKS - Daiton McCome ::: Apps D CHM211 D Sign In-Bird

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C Chegg Study Guided ScA ALEKS - Daiton McCome ::: Apps D CHM211 D Sign In-Bird iD Skils How to AALEKS Assessmen online Application DInternships lob Cat D Answer keyfor ael tri ro act Sheets Other bookmark ACIDS AND BASES Understanding connections between descriptions of weak acid d... Dalton When a 0.09 Maqueous solution of a certain acid is prepared he acid is 20 % dissociated Calculate the acid dissociation constant the acid Round your answer to 2 significant digits. x10 Ar Explanation Check 10:09 PM O Type here to search

Explanation / Answer

HA   <—>   H+   +   A-
0.091       0       0   (initial)
0.091-x   x       x   (at equilibrium)

%. dissociation = x*100/0.091
20 = x*100/0.091
x = 0.0182 M

Ka = [H+][A-]/[HA]
= x*x/(0.091-x)
= (0.0182* 0.0182)/(0.091-0.0182)
= 4.55*10^-3

Answer: 4.55*10^-3

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