_ CHM 113_ Glassware.pdf - Introduction: Accuracy is how...

Introduction:
Accuracy is how close the observed value is to the real standard value, while
precision is how close multiple measurements are to each other. It is possible to be
accurate but not precise, precise but not accurate, or both accurate and precise. When
performing measurements in an experiments, it is crucial to utilize correct significant
figures, which controls how accurate or how inaccurate certain measurements are
made. Dilution is the action that reduces the concentration of a sample. The most
common way to dilute a liquid sample is to add water. Density is an intensive property
of substances/objects which measures how tightly compacted the matter is in the
specific substance/object. The formula of Density is typically: Density = Mass/Volume,
because density measures how much matter —which is mass— that a certain
substance/object has in comparison to its volume. The central objective of this
experiment is to determine the most accurate and precise glassware when measuring
certain samples.
Procedures:
Part I:
First, acquire the following materials: Beaker (50 mL and 600 mL), Volumetric
Flask, Burette, Graduated Pipet, Pipette safety bulbs, Water, Scale/balance, and
Thermometer. Then find the temperature of the water using the thermometer. Next,
using the temperature, research the density of water at the observed temperature.
Then find the mass of each container using the scale and fill each container with water

to approximately 10 mL. Next, find the mass of each container with the water.
Following that, Subtract the initial mass of each container from the mass of each
container with water. Then, find the percent error using by subtracting the experimental
value from the accepted value, then divide it by the accepted value. Next, compare the
percent error of each container to find the greatest accuracy and then repeat steps 1-9.