State three precautions that must be observed to ensure accurate results in this experiment.

Here are three precautions that must be observed to ensure accurate results in a titration experiment:

1. Rinse the burette, pipette, and conical flask correctly. The burette and pipette should be rinsed with the solution they are to contain (acid for burette, base for pipette) to prevent dilution. The conical flask should be rinsed with distilled water, as any remaining water will not affect the number of moles of reactant delivered into it.
2. Read the burette at eye level. This prevents parallax error, ensuring that the volume of solution dispensed is read accurately from the bottom of the meniscus.
3. Add the indicator dropwise and observe the endpoint carefully. Only a few drops of indicator should be used to avoid affecting the reaction's stoichiometry. The endpoint should be noted at the first permanent color change, which signifies neutralization. Using a white tile underneath the conical flask can help in observing this color change clearly.