Cliffs AP Chemistry, 3rd Edition

(3) NaOH was 0.150 M instead of 0.100 M.

• It would take less NaOH to reach the equivalence point because the NaOH is
  stronger.


• Because it would take less NaOH, the number of moles of NaOH would be less
  than expected, causing the denominator (moles) to be smaller than expected,
  making the calculated MW larger than expected.

Note: Using volume averages in the design of this particular experiment can lead to inac-

curacy. A better design would be to calculate three values for molecular weight from three

separate runs and average the results.

Part II: Specific Topics