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Finding pH at equivalence - Acid Base Titrations

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In a titration experiment, if the initial solution pH is 9.0 and equivalence point occurs at pH 3.0, then the reaction corresponds to

a. the titration of a strong acid by a strong base

b. the titration of a strong base by a strong acid

c. the titration of a weak acid by a strong base

d. the titration of a weak base by a strong acid

e. the titration of a weak acid by a weak base

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