PROBLEM SET 1
Biochemistry Lecture
1. In analyzing a sample of polluted water, a chemist measured out a 25.00-mL water
sample with a pipet. At another point in the analysis, the chemist used a graduated
cylinder to measure 25 mL of a solution. What is the difference between the
measurements 25.00 mL and 25 mL?
2. To check the accuracy of a graduated cylinder, a student filled the cylinder to the 25-mL
mark using water delivered from a burette and then read the volume delivered. Following
are the results of five trials:
Trial Volume Shown by
Graduated Cylinder
Volume Shown by the
Burette
1 25 mL 26.54 mL
2 25 mL 26.51 mL
3 25 mL 26.60 mL
4 25 mL 26.49 mL
5 25 mL 26.57 mL
Average 25 mL 26.54 mL
Is the graduated cylinder accurate?
