4. Explain whether each of the following is a source ofexperimental error: a. A

Question

4. Explain whether each of the following is a source ofexperimental error: a. 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 weighs out his KHP for each trial, and transfers the KHP to the appropriate flasks. b. He does not condition the buret. c. He does not fill the buret tip with solution before the first titration. d. He transfers the stir bar straight from flask e 1 to flask a2 without washing or rinsing it. e. He washes and rinses the flasks but again does not dry them before pipetting the vinegar into each.

Explanation / Answer

4)

a] no error as deionized water has to be add to the flask. so wet flask donk cause any error

b] it will cause error, because the strength of NaOH will change

c] it will cause error as the extra reading will be count.

d] it will not cause error as if flask 1 is nutalised, other wise it will cause error.

e] vinigar is diluted CH3COOH, so small amount of water (due to wet flask) will not cause any error.

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