Mikaela B.

Concentration of H+

HA is a weak, monoprotic acid that dissociated according to the equation:

HA (aq) ßà H+ (aq) + A- (aq)                  Ka = 4.0 x 10-9

If the initial concentration of HA is 0.10 M, find the concentration of H+

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Mikaela B.

Thank you! This was really helpful.
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05/27/19

Ellen E.

Careful. There's an issue with the quadratic solution here. I will post answer in a moment. Notice that : a) x2 = 4.0 x 10-11 - 4.0 x 10-9 x should be x2 = 4.0 x 10-10 - 4.0 x 10-9 x and b) x2 - 4.0 x 10-11 + 4.0 x 10-9 x should be x2 + 4.0 x 10-10 - 4.0 x 10-9 x AND anyway, you should use an approximation here. I will explain when I post my answer in a moment!
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05/27/19

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