I don’t think my 20 mL volumetric pipet percent error is correct but I keep comi
ID: 564469 • Letter: I
Question
I don’t think my 20 mL volumetric pipet percent error is correct but I keep coming up with the same answer. Please help. Zoom to see percent error (g).Tolerance printed on the 20 mL volumetic pipet Precision of the pipet Volume dispensed with the pipet Mass of the 50 mL beaker Mass of the 50 mL beaker with water Mass of the water h. What happened to the semperature and density of the water in the 400 ml beaker throughout today's lab? Circle your responses. Temperature: Irease Density 20.00 155739 Increase Stop and clean up (Part 8) when you get to this part of the procedure. if you heve time ett over before the end of lab, complete the wonksheet up to thvis point i you were umave to complete Part 5 duning is lab, then start with & next week e. Part 6. Dispensing Volumes with a Volumetric Pipet ,0115158 Shudy the Glassware Protocof in Blackboard for pipets r. Velume calkculated from mass and density Obtain approximately 200 mL of distilled water in a clean 400 mL beaker. Add one drop of food coloring to this beaker and sir with a glass stir rod Fotow a·the appropriate steps to prepare notoo :/ Practice using the pipet before performing the transfer step Detemine tho temperature and density of the water in the 400 ml, beaker 20 vohmetrie ppet er use. g. %Error one voire detemnadon: ouek shis Use w weigh and record the mass of a. Draw a picture of the 20 ml volumetric pipet r from the 400 mL beaker and the appropriate giasowe poket transfer water with the 20 mL pipet to a clean, dry, and pre weighed 50 mL beaker. Aner compleing the worksheet beow, show your work to your instuctor 50 mL beaker and water to the nearest 0.1 mg. Part 7. Reading Graduated Cylinders and Burets: paticular otterdon be mated soale of solution comtained by each graduated cyinder, and volume readings are performed for lab you will find several graduated eylinders and burets filled with different quansties of colored waber and the smalest divisions on each make your readings to the Examine each cyinder and tum paying level of precision permited by each of the cylinders each. (For this part of the procedure, single practioe purposes only. and the diference between two volume delivery volume) delermives t b. Water Temperature Determine the volume wing for e In an experiemert bureis are used to dispense volumes 70.0 798 e Water Density the 'total volume' that should be reported.) 20
Explanation / Answer
Water density at 20°C = 0.9984073 g/mL
Calculated volume = 19.8142/0.9984073
= 19.8458 mL
% error = (actual - experimental)*100/actual
= (20 - 19.8458)*100/20
= 0.771%
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