Question

A student fails to clean the pipet first. after delivering the vinegar sample, the student notices a drop of vinegar clinging to the inner surface of the pipet. How would this affect the concentration of Ch3COOH? Will concentration be higher or lower?

Answer 1

This should not matter because the pipet has gradations and usually more of the sample is taken up in the pipette than what is delivered into the flask the student should always rinse the container being used because they are contaminating the sample if they do not clean it out