How is Lab Glassware Used Lab #2.pdf - How is Lab Glassware...

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How is Lab Glassware Used?By:Mazen Alzahrani, Lorinda Harmon, Raena Horta, Natalia Lopez, Kyara Mitchell, MaryWesterveltTA’s: Suneet Kale & Souvik PoddarLab Section 13026Wednesday 2:30-4:20
Introduction:The lab glassware is a fundamental part of each laboratory. It allows us to measure thequantity of a substance, which leads to more accurate and precise results. Accuracy and precisionare important concepts in chemical experiments. Accuracy is how close a measured value is tothe actual (true) value, and the type of glassware used in the measurement plays a vital role in theaccuracy of the experiment. On the other hand, precision is measured by repeating measurementsunder unchanged conditions and comparing how widely the results vary. Besides accuracy andprecision, the significant figures are also no less important than the two, as the more significantfigures there are, the more precise the measure is. However, this lab consists of three parts. In thefirst part, we have used different lab glassware types: beaker, graduated pipette, buret, andgraduated cylinder, to determine each equipment's precision and accuracy. In the second part, wehave determined the volume and mass of a drop of water to know how many drops it takes tomake a 1.0 mL volume. In the third part, a technique for weighing different amounts of sandusing an electronic balance has been developed. Moreover, in our experiments, we used theformula D=m/v (density equals mass divided by volume) to calculate the water samples' massfrom the volume measurements and the known density values. And we used the formula%?𝑖???𝑟????= (|𝑉𝑎𝑙??1 −𝑉𝑎𝑙??2|/𝐴??𝑟𝑎?? ?? 𝑉𝑎𝑙??1𝑎??2 )× 100, to compare between thetwo mass values and see how our measurements are accurate.Procedure:Materials Needed:Proper PPEPenNotebook for note takingDistilled Water(2) 50mL beaker10 mL Graduated Cylinder
50 mL BuretElectronic Balance10 mL Graduated PipetPart 1A: Graduated BeakerFirst, obtain (2) 50 mL volume beaker. Fill one of the beakers with any random amountof distilled water that is less than 50 mL. Record the volume of the distilled water in the beaker.The volume can be determined by reading the meniscus at eye level. Be sure to measure thevolume to the nearest whole numberto get the most accurate reading. Record the determinedvolume in your notebook with a pen. The next step is to obtain the experimental measured massof the distilled water in the beaker. First, pour the measured distilled water into a differentBeaker. Place the now empty beaker on an electronic balance. Zero out the weight of the emptygraduated beaker on the balance. Next, pour the measured amount of distilled water back into itsoriginal graduated beaker that has been zeroed out. Record the mass determined by the electronicbalance scale in your notebook. Be sure to record all the numbers shown on the scale becausethey are all significant figures in the experiment. After recording the experimental mass for trialone, repeat all steps in order to get information for trial 2.

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Term
Fall
Professor
Birk
Tags
Accuracy and precision, Laboratory glassware

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