a) A 0.5000 g sample of an unknown acid is titrated with 0.1000 M NaOH. the first equivalence point is reached when 24.50 mL of base have been added....

a) A 0.5000 g sample of an unknown acid is titrated with 0.1000 M NaOH. the first equivalence point is reached when 24.50 mL of base have been added. What is the molecular weight of the unknown acid?

b) what is the molecular weight of the unknown if the perceived first equivalence point was actually the second equivalence point?