Report the following measurement to the correct number of significant figures Is
ID: 968832 • Letter: R
Question
Report the following measurement to the correct number of significant figures Is the % error the same for each Instrument? You are required to measure approximately 50 ml of a liquid, what instrument would you use? Why? You are required to measure accurately 25, ml of a solution of NaCl. What instrument would you use? Why? Suppose you are using the thermometer to measure the temperature of a water bath between 101 and 105 degree C. To how many significant figures the temperature should be recorded? Explain. The known volume of a sample A is 15.0 ml but you measured 15.1 ml. The known volume of sample B is 100.0 ml but you measured 100.1 ml. Calculate the percentage of error for each sample. For which sample is the error more significant? Explain. Using a large graduated cylinder like the ones you used in the lab, a student measures out 127 mL of a chemical solution for an experiment and pours it into a beaker. Then, using aExplanation / Answer
3 - To measure 50 ml of a liquid we wouls use - pipette. This would allow transfer of the volume without any loss and with maximum accuracy.
4 - To measure 25 ml NaCl solution we would use - pipette. This would ensure we are taking right voluem and then accurately transferring the solution without any loss. If in case we are dealing with titration, one may also use buret in some cases.
5 - To report a temperature value of 101 oC to 105 oC, we would report it to 1 significant figure.
6 - For the given values
a. percentage error sample A = ((15 - 15.1)/15) x 100 = 0.66%
percent error for sample B = ((100 - 100.1)/100) x 100 =0.1%
b. For sample A the error is more significant as the volume is lower.
any change in value would influence the end result more than when we use larger volume as in sample B.