Swirl gently to equilibrate. Proceed just as before, adding increments, waiting for temperature equilibrium, and recording volumes. Treat data as you did the acid data. Plot acid and base data on the same graph so that two intersecting lines are present. Note the mole ratio at the intersection.
Bases Watch the movies and answer the questions.
The Job's plot for the titration of citric acid with sodium hydroxide shows a maximum near the region of 0.75 mol NaOH per 0.25 mol citric acid. On the basis of this result, predict the number of titratable protons per molecule of citric acid. The student must have the thermistor calibration file on a floppy disk. Allow at least one hour for the solutions to reach room temperature. Data may be collected with the Macintosh ULI interface, but you must paste data into a different graphing program.