What is the concentration of undissociated acid if the hydrogen-ion concentration is 0.000 1 M and the acid di?

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Posted on : 25-10-2013 | By : My Study Coach | In : Improve Your Concentration
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What is the concentration of undissociated acid if the hydrogen-ion concentration is 0.000 1 M and the acid dissociation constant is 0.000 000 1?

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Comments (1)

Use ICE (initial, change, equilibrium) table

Given:

–HA = H+ + A-
I
C
E——-0.0001

Ka = [H+][A-]/[HA] = 0.000 000 1

Let
x = concentration of undissociated acid HA
y = change in concentration

Therefore,

–HA = H+ + A-
I—x
C–(-y)—(+y)–(+y)
E–(x-y)—0.0001–y

Therefore,
[H+] = y = 0.0001

It follows that
[A-] = y = 0.0001
and
[HA] = x – y = x – 0.0001

Substitute to the acid dissociation expression:

Ka = [H+][A-]/[HA] = 0.000 000 1
(0.0001)*(0.0001)/(x – 0.0001) = 0.000 000 1
1 x 10^-8 = (0.000 000 1)x – (1 x 10^-11)
x = 0.1001 M = [HA] –> concentration of undissociated HA

That’s it!n_n

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