How is Lab Glassware Used_.docx - How is Lab Glassware Used...

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How is Lab Glassware Used? Joel Wade, Brent Haws, Amsi Perez, Ashley Malay IA: Abhik Manna 02/3/2020 CHM 113 Tuesday 8:30am
Introduction Equations Used: Percentage of error = ((Experimental - Accepted)/Accepted)*100 Experimental - The value achieved through our calculations Accepted - The value recognized as correct The percentage of error equation was useful in this lab in part 1. It was used to see how accurate our measurements of mass were compared to the true value. It was also useful in part 3 to determine how much of a substance was lost when transferring between two containers, D=m/V D - Density m - Mass V - Volume Density is the measure of how compact a substance is. The equation (dividing mass by volume) makes sense because it determines how much of the substance is existent over a certain area. The density equation is useful in this lab to help determine the mass in part 1 and volume in part 2. In this lab, the goal was generally to get familiarized with the common glassware used in the lab. The main glassware used were beakers, graduated pipettes, burets, and graduated cylinders. Using this glassware, experiments were performed to determine their accuracy and precision. Accuracy is how close a measured value is to the actual value. Precision is measured by repeating measurements under unchanged conditions and comparing how widely the results vary. Determining the correct amount of significant figures to use when recording the results of experiments was also a goal of this lab. Significant figures are all digits of measured quantity.
Significant figures are important because they allow for more precise measurements. For part 1, the general approach was finding the percentage of error using the specified equipment (the four types of glassware mentioned earlier) by using the calculated value and the accepted value. This way, the accuracy of each type of glassware was determined. It also showed how to use various types of lab equipment and how to use the correct number of significant figures. For part 2, the volume (using density equation) of a larger number of drops of water were found using beakers, then divided by the number of drops to find the volume of one drop.

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