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The Ka for a particular weak acid is 4.0 x 10-9. Calculate the pH of a 0.040 M solution of this acid.

whats the relation b/w Ka and pH?

3 answers

You must use Ka to determine the (H^+), then use pH = -log(H^+) to determine pH.
How do we find [H+]?
Ka= [A^-][H^+]/[HA]
you have to make an ice table
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