Experiment 8 Pre Lab
Introduction to Acid-Base Titration
Key Concepts: Understand the use of volumetric glassware, indicators, endpoints, acid-case
reactions and titrations.
Part I: Objective: To determine the volume of the pipette. Determine the accuracy and precision
of a 5.00 mL volumetric pipette.
Experimental Procedure Part I: Determine the accuracy and precision of a 5.00mL volumetric
pipette by adding five portions of water to a 50mL Erlenmeyer flask and recording the mass of
the flask and water for each trial. Use the density of water and the temperature to find the volume
of water transferred for each trial. Calculate the percent error and RSD and comment on the
accuracy and precision of the 5.00mL volumetric pipette.
Part II Objective: To determine the concentration of the hydrochloric acid.
Experimental Procedure Part II:
Make 0.0100 M HaOH from 5.00 M solution using a 100.0mL volumetric flask. Make a sample
of HCI to titrate by diluting 3.5 mL of 3.00 M HCI into a 125 mL Erlenmeyer flask containing
about 25mL of water and then fill to the 50mL line. Never add water to the concentrated acid
solutions. Individually titrate four 5.00 mL samples of diluted acid with the .100 M NaOH
solution. Calculate the RSD for the four titrations and comment on the precision of your
Using a 100.0mL volumetric flask dissolve the solid in 60 to 80mL of solvent first and then fill
the flask to the calibration line. In the titration section of this experiment, I will dilute 2.00mL of
5.00 M sodium hydroxide in a 100.0 mL volumetric flask.
To determine the accuracy and precision of the 5.00mL pipette, the mass of 5.00mL of water
obtained from the 5.00mL volumetric pipette will be determined. The mass can then be used to
calculate the volume of this water sample.
First, the mass of an empty 50mL Erlenmeyer flask is recorded.