A 25.00 mL sample of hydrochloric acid contained in an Erlenmeyer flask is titrated…
CHEMISTRY · Multi-part · AP · Chemistry · Chemical Reactions · Chemical Reactions
Problem
A 25.00 mL sample of hydrochloric acid contained in an Erlenmeyer flask is titrated with 0.108 M sodium hydroxide delivered from a buret. The balanced molecular equation for the neutralization is
HCl(aq)+NaOH(aq)→NaCl(aq)+H2O(l)
The initial buret reading is 1.64 mL and the final buret reading is 27.92 mL.
(a) Calculate the number of moles of NaOH delivered from the buret.
(b) Determine the number of moles of HCl present in the acid sample.
(c) Compute the molarity of the original HCl solution in the flask, expressing the answer to the correct number of significant figures.
(d) If the final buret reading were recorded 0.05 mL higher than the true value, predict qualitatively (increase, decrease, or no change) how the calculated molarity of the acid would be affected and justify your prediction based on stoichiometric reasoning.