Explain whether each of the following is a source of experimental error:
- A student obtains three Erlenmeyer flasks, and he washes and rinses them. He dries the outside of each flask, but not the inside. He then weight out this KHP for each trial, and transfer the KHP to the appropriate flasks.
- He does note condition the buret.
- He does note fill the buret tip with solution before the first titration.
- He transfer the stir bar straight from flask #1 to flask #2 without washing or rinsing it.
- He washes and rinses the flasks but again does not dry them before pipetting the vinegar into each.
