# Investigation Two_ How is Lab Glassware Used_.pdf - Lab#2...

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Lab #2: Which Glassware Is Most Efficient? Group 1 Members: TA: Julie Rodriguez Christina Smith Elise Lange Amy Platter Lab Session: Salman Ahmad 8/23/18 from 12:30pm-2:20pm
INTRODUCTION: A few important concepts in this lab are the understanding and use of precision and accuracy when it comes to measuring values in a laboratory. The difference between precision and accuracy is that accuracy leans more toward how close a measured value is to an already set value. Precision is the independent of accuracy, meaning that one can be very precise but still not very accurate. The importance of significant figures is that they represent the precision and accuracy of a value in science. They are used to avoid variability and help make calculations more absolute and to the point. When making these calculations, it is imperative that the significant figures are all accounted for which will help the preciseness of the experiment. The purpose of dilution is to reduce a dense amount of cells so that it is not very concentrated and therefore able to be utilized for an experiment. In chemistry dilution is often used to reduce the amount of bacteria by a specific amount. Also relevant in this lab, are the concepts of density which are the mass of something and how much space it takes per unit volume. As shown by Brown, Lemay, Bursten, Murphy, Woodward, and Stolzfus, the formula is Density = Mass/ Volume, the weight of a substance divided by the amount of space it takes up is how dense it is (Brown 2017). The goals of this experiment is to find proper laboratory equipment that is necessary to measure out certain substances and how precise they need to be. As well as using the correct amount of significant figures with each calculation along with coming up with procedures to rightfully measure out the appropriate amounts for volume of water utilizing the four different pieces of glass equipment.
PROCEDURE/EXPERIMENTAL: First they weighed a 50 mL beaker on an electronic balance. Then put 20 mL of water