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Title: What is the concentration of undissociated acid if it hydrogen-ion concentration is.....? Post by: tonichilds83 on Sep 8, 2012 What is the concentration of undissociated acid if it hydrogen-ion concentration is 0.0001 M and the acid dissociation constant is 0.0000001?
a) 1 x 10^-1 M b) 1 M c) 1 x 10^-4 M d) 10 M Title: What is the concentration of undissociated acid if it hydrogen-ion concentration is.....? Post by: illicitf8 on Sep 8, 2012 [HA]=[H+][A-]/Ka
[H+]=[A-] [HA]=[H+]^2/Ka [HA]=(10^-3)^2/10^-6= 1M Title: Re: What is the concentration of undissociated acid if it hydrogen-ion concentration is.....? Post by: kh006 on Oct 4, 2012 when the acid dissociates
HA --> H+ + A- initially [HA] = x mol/L [H+] = 0 [A-] = 0 after dissociation [HA] = x - 0.0001 mol/L [H+] = 0.0001 mol/L [A-] = 0.0001 mol/L now you are able tho determine the value of x and thus the concentration of the undisociated acid which is (x-0.0001) since the concentrations of HA ,H+, and A- are related by the acid dissociation constant given to be 10^-7 [HA] = 10^-1 mol/L |