Copy of How is lab glassware used_group 2_T, 8-30.pdf - How...

This preview shows page 1 - 4 out of 11 pages.

The preview shows page 2 - 4 out of 11 pages.
How is Lab Glassware Used.John BeckerGroup 4 thursday 8:30-10:20Chem 113Introduction
It is important for one to fully understand the use of glassware and other equipment inchemistry labs. There is always uncertainty when making measurements and choosing thecorrect apparatuses to do so. Becoming familiar with taking measurements and choosingappropriate glassware contributes to a great part of properly recording accurate and/or precisedata. Accuracy can concisely be defined as exactness or correctness. In chemistry, accuracy ishow close a measurement is to its actual value. Since not all measurements are completelyaccurate, a degree of uncertainty is taken into consideration when recording measurements. Thedegree of uncertainty also greatly depends on the equipment used to measure. Precision is howclose a set of measurements are to each other or to a standard value. Through the use of propersignificant figures, one can see the precision of a measurement. It is important for one to use thecorrect amount of significant figures for different types of measurements (2). Dilution is when asolvent is added to a solution and the concentration of the solution is lessened. For example,melting ice dilutes a cup of iced tea (1). Density is mass per unit volume of a substance. Theequation which is used to calculate density is:D=mVWhere, D=density (g/mL)m=mass (g)V=volume (mL)Equation 1:equation for densityThe overall goal of this lab is to become more familiar with measuring liquids in lab glassware,learn how to properly measure liquids and solids on a scale, and collect data.Procedure
The following results are separated into four distinct experiments. In the first experiment,a procedure was created to determine the precision and accuracy of each glassware. Theglassware used in this lab includes: a 50mL beaker, 10 mL graduated cylinder, 50 mL buret, anda 10mL graduated pipet. Water was measured in each of the glasswares two different times. Thecalculated masses, measured mass, and perfect difference was recorded. The equation for percentdifference used in the lab is written as:% error =AcceptedV alueExperimentalV alueAcceptedV alue||00× 1Equation 2:Percent error equation.In the second, the volume and mass of a drop of water was determined and a conversion factorwas created for the number of drops it takes to make a 1.0 mL volume. The container used tomeasure the water was a 10mL graduated cylinder. The data recorded was the mass of the emptygraduated cylinder, mass of a full container of water, the mass of one drop, the volume, and thenumber of drops per mL. The third experiment involved an electronic balance to weigh various

Upload your study docs or become a

Course Hero member to access this document

Upload your study docs or become a

Course Hero member to access this document

End of preview. Want to read all 11 pages?

Upload your study docs or become a

Course Hero member to access this document

Term
Winter
Professor
NoProfessor
Tags
Chemistry, Accuracy and precision, Laboratory glassware, Stock Dye Solutions

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture