Title: Titration Curve of a Weak Acid with a Strong Base
Time: 2.5 hrs
Equipment Needed:
pH meters - get them down from the wall cabinet. When putting them away, place a
drop of pH 7 buffer in the rubber cap for the electrode before storage.
burets - 2 per student
2 mL pipets - 1 per student
pipet bulbs - 1 per student
Solutions Needed:
STOCK SOLUTIONS:
0.5L1MAcetic Acid - Labeled
0.5L1MSodium acetate - Labeled
0.5L1MAmmonia - Labeled
0.5L1MAmmonium Chloride - Labeled
Student Solutions:
1L 0.10 M Acetic Acid - Labeled
1L 0.10 M Sodium acetate - Labeled
1L 0.10 M Ammonia - Labeled
1L 0.10 M Ammonium Chloride - Labeled
10 L 0.100 M HCl - Harriman - on the superstructure
10 L 0.100 M NaOH - Harriman - on the superstructure
Vinegar 1 gal bottle - Harriman - on the superstructure
5% Phanolpthalein solution - solvent ethanol
Special Solutions Needed:
pH 4 buffer and pH 10 buffer for calibration. pH 7 buffer for electrode storage.
Special Preparation Instructions:
Check the batteries in the portable pH meters. If weak replace with batteries
stored in refridgerator (if any there) and recheck.
Check the electrode by adjusting the pH meter with pH 4 buffer (make sure the
temperature compensator is set properly). Then check with pH of 10 buffer. If
the latter reading is below 9.5, replace the electrode. Discard the old electrode.
Special Instructor Instructions
Go to each pH meter and calibrate with pH 4 buffer.
Tell the students not to change the calibrations of the pH meters. Tell them if they
