Post-Laboratory Questions Use the spaces provided for theanswersand additional p
ID: 474931 • Letter: P
Question
Post-Laboratory Questions Use the spaces provided for theanswersand additional paper ynecessary 1. For object 1, compare the mass you determined using the electronic balance with the mass you de- termined using the triple-beam balance. If these masses are identical, comment on the relative ease of use for the two balances. If these masses differ, suggest a reason for the difference. 2. Based on your calculated number of drops in 1 mL of water, how reproducible were your drop vol umes? Briefly explain. 3. The calibration marks on a 100-mL and a 10-mL graduated cylinder are shown below. Briefly ex plain why it would be more accurate to measure 9.7 mL of water using a 10-mL graduated cylinder, rather than using a 100-mL cylinder. 100 mL 10 mL. 100-mL graduated 10-mL graduated cylinderExplanation / Answer
1. Measurement with an electronic beam balance are more precise when compared to electronic balances. The measurement is much easier and faster on a electronic balance as opposed to electronic beam balance.
2. The results based on the number of drops of water in a ml, the results were close to precision. A large number of readings would reduce the error in measurement.
3. It would be more accurate to measure a lower volume 9.7 ml using a smaller cyllinder 10 ml as the error in meaurment would be less. Smaller cyllinders are calibrated for lower value measurements, Larger cyllinders are more accurate for higher values.
4. Turn on the balance first. Put butter paper in a boat form on the balance. Weigh the paper. Tare the balance to read zero on the scale. Weigh NaCl 1.35 g. Take the paper out. Measure the weight of the test tube and add NaCl to it. Note doen the total weight. This should give the weight of NaCl transferred into the tube.