An unknown diprotic acid solution is analyzed by titration with 0.108 M NaOH
CHEMISTRY · Multi-part · A Level · Chemistry · Acids and bases · Acids and bases
Problem
An unknown diprotic acid solution is analyzed by titration with 0.108 M NaOH. A 25.00 mL aliquot of the acid solution is placed in a flask for each trial, and the following buret readings are obtained at the end point.
Trial 1: 27.02 mL NaOH
Trial 2: 26.87 mL NaOH
Trial 3: 27.11 mL NaOH
An accepted literature value for the concentration of the acid solution is 0.526 M.
(a) Compute the molarity of the diprotic acid for each trial. Include appropriate units and significant figures.
(b) Calculate the mean molarity of the acid solution based on the three trials.
(c) Determine the percent error of the experimental mean relative to the accepted value.
(d) Evaluate the precision of the titration results by commenting on the spread of the individual trial values. Support your answer with quantitative evidence.