Answer: Volume of base added from the buret is plotted on the x-axis of the titration curve.
Step-by-step explanation:
This is because the amount of base added determines the pH of the solution in the beaker, which is measured and plotted on the y-axis. The volume of the base added to the solution in the beaker is a direct reflection of the amount of base in the solution, and thus, it is the most logical choice for the x-axis of the titration curve.