Homework Help: Chemistry

Posted by Cheryl on Thursday, May 26, 2011 at 8:56pm.

In the titration of a weak acid with a strong base, the pH at the equivalence point is affected mostly by
a.hydrolysis (reaction with water) of the weak acid
b.the dissociation of water molecules
c.the presence of excess base
d.the hydrolysis of the conjugate base of the weak acid
e.the presence of a small amount of weak acid in equilibrium with its salt

Really confused by this question.. please help T^T thanks.

Chemistry - DrBob222, Friday, May 27, 2011 at 12:54am
HA + NaOH ==> NaA + H2O is the titration. So at the equivalence point we have NaA which is the conjugate base of HA and you can see that the reverse reaction (which is the hydrolysis) of NaA gives the HA and OH^-. So d.
Chemistry - Cheryl, Friday, May 27, 2011 at 5:38am
Million thanks =)

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