CHEM 102 Lecture Notes - Lecture 1: Pipette, Graduated Cylinder, Osmosis
Document Summary
In order to determine which of the following instruments measures most accurately and most precisely, 10 ml of room temperature reverse osmosis water was poured from a graduated cylinder into a pipette, burette and beaker. The mass and volume of the water in the labelled beaker was calculated three times. Figure 1: from left to right- graduated cylinder, burette, pipette. The accuracy of a measurement is how close it gets to the true value while the precision of a measurement refers to how close each measured numbers are to each other. A measurement can be very precise but not accurate. The water measurement from the pipette averaged 9. 768ml, the graduated cylinder measurement averaged 9. 672 ml, and the burette measurement averages. This data concludes that the burette was the most accurate measuring tool because it got closest to the expected10ml. The smaller the range, the more precise the data.
