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Home Q & A Board Science-Related Homework Help Chemistry (Moderator: Laser_3)
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LimitedFury LimitedFury
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11 years ago
Calculate the acid dissociation constant of a weak monoprotic acid if a 0.5M solution of this acid gives a hydrogen-ion concentration of 0.000 1M?  
 Hint: Monoprotic means containing one proton.Neutral Face

Can someone please help me with this?? I cannot get the answer!!!
10 points for best answer!
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wrote...
#1
11 years ago
idk
wrote...
#2
11 years ago
HA <=> H+ + A-
start
0.5
change
-x .. . . .+x .. . . +x


x = [H+]= [A-]= 0.0001 M

Ka = [H+][A-]/ [HA] = 0.0001 x 0.0001 / 0.5 - 0.0001 =2 x 10^-8
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