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The weak acid HQ has a pKa of 4.89. calculate the [OH-] of .50 M HQ.

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HQ ==> H^+ + Q^-

Ka = (H^+)(Q^-)/(HQ)
Convert pKa = 4.89 to Ka from pKa = -log Ka.

Let H^+ = x, Q = x, HQ = 0.5-x
Solve for x, convert to pH, then to pOH.
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