Homework Help: Chemistry

Posted by Sharon on Thursday, January 27, 2011 at 8:09pm.

For a solution that is 0.20 M HCN(aq) with a Ka=4.9x10^-10

a. calculate the [H+]
b. calculate the [OH-]
c. what's the pH?

Please show your work on how to solve it. Thank you

Chemistry - DrBob222, Thursday, January 27, 2011 at 9:02pm
.............HCN ==> H^+ + CN^-
initial....0.20M.....0.....0
change......-x.......+x.....+x
final.... 0.20-x......x.....x

Ka = ((H^+)(CN^-)/(HCN)
Substitute from the above and solve for (H^+).
pH = -log(H^+)
pH + pOH = pKw = 14
Post your work if you get stuck.
Chemistry - Sharon, Thursday, January 27, 2011 at 10:38pm
Thanks! That was helpful.

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