A student titrates 25.00 mL of an aqueous HCl solution with 0.1000 M NaOH
CHEMISTRY · Multi-part · AP · Chemistry · Acids and Bases · Acids and Bases
Problem
A student titrates 25.00 mL of an aqueous HCl solution with 0.1000 M NaOH. According to the stoichiometric calculation, the equivalence point should occur at 24.80 mL of added NaOH, but the indicator used changes color at 24.95 mL.
(a) Using appropriate significant figures, calculate the molarity of HCl the student will report based on the observed end-point volume.
(b) Compute the percent error in the student’s reported molarity relative to the true molarity implied by the stoichiometric equivalence point.
(c) State whether the student’s reported molarity is higher than, lower than, or equal to the true molarity, and explain why in terms of how the timing of the indicator color change affects the titration results.