1) Suppose you use your calibrated 25-mL pipet twice to deliver “50 mL" liquid, what is the actual total volume? What is the error in the final volume?
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1) Suppose you use your calibrated 25-mL pipet twice to deliver “50 mL" liquid, what is the actual total volume? What is the error in the final volume?
2) Suppose you use your uncalibrated 25-mL pipet to transfer liquid, what is the systematic error in the transferred volume? If you use it twice, what is the size if the systematic error in the total volume?
My calibrated pipet had an average and standard deviation of 24.77 ml +/- 0.006 ml.
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- 1. The tolerance of a Class A 50 mL transfer pipet is ±0.05 mL. A student uses an uncalibrated Class A transfer pipet to deliver a total of 300 mL of solution. What is the uncertainty in the delivered 300 mL? ± ______________ mL 2. Next, the student calibrates the pipet. The calibrated pipet delivers a mean volume of 49.994 mL with an uncertainty of ±0.005 mL. The student then uses the calibrated 50 mL pipet to deliver a total of 199.976 mL of solution. What is the uncertainty in the delivered 199.976 mL? ± _______________ mLState whether the errors in (a)–(d) are random or systematic:a. A 25-mL transfer pipet consistently delivers 25.031 ± 0.009 mL.b. A 10-mL buret consistently delivers 1.98 ± 0.01 mL when drained from exactly 0 to exactly 2 mL and consistently delivers 2.03 mL ± 0.02 mL when drained from 2 to 4 mL.c. A 10-mL buret delivered 1.983 9 g of water when drained from exactly 0.00 to 2.00 mL. The next time I delivered water from the 0.00 to the 2.00 mL mark, the delivered mass was 1.9900 g. d. Four consecutive 20.0-L injections of a solution into a chromatograph were made and the area of a particular peak was 4 383, 4 410, 4 401, and 4 390 units.A 5.00 (±0.01) mL5.00 (±0.01) mL Class A transfer pipet is used to transfer 5.00 mL5.00 mL of a 0.253 (±0.003) M0.253 (±0.003) M Cu2+Cu2+ stock solution to a 100.00 (±0.08)100.00 (±0.08) Class A volumetric flask. Deionized water is used to bring the flask to volume. Calculate the concentration of the diluted soluion in the volumetric flask and report its absolute uncertainty.
- (a) Explain the difference between systematic and random errors. State whether the errors in (b)–(e) are random or systematic. (b) A 25-mL transfer pipet consistently delivers 25.031 + 0.009 mL when drained from the mark. (c) A 10-mL buret consistently delivers 1.98 6 0.01 mL when drained from exactly 0 to exactly 2 mL and consistently delivers 2.03 6 0.02 mL when drained from 2 to 4 mL. (d) A 10-mL buret delivered 1.983 9 g of water when drained from exactly 0.00 to 2.00 mL. The next time I delivered water from the 0.00 to the 2.00 mL mark, the delivered mass was 1.990 0 g. (e) Four consecutive 20.0-mL injections of a solution into a chromatograph were made (as in Figure 0-6) and the area of a particular peak was 4 383, 4 410, 4 401, and 4 390 units. (f) A clean funnel that had been in the lab since last semester had a mass of 15.432 9 g. When filled with a solid precipitate and dried thoroughly in the oven at 1108C, the mass was 15.845 6 g. The calculated mass of precipitate was…During the course of an analysis for a solid sample, a loss of 0.40 mg occurs. Calculate the percentage (%) of relative error due to weight loss inherent in the method. A. When the method is performed on a sample with a total weight of 4.0 mg. B. When the method is performed on a sample with a total weight of 400.0 mg. C. Briefly, discuss what would be the most appropriate sample size ((a) or (b)) for the analysis assuming that weight loss is inherent in the method and is not due to gross error.Categorize each as a determinate or an indeterminate error and further classify determinate errors as instrumental, method or personal.d) The tip of the pipet used in the analysis is broken. e) In measuring the same peak heights of a chromatogram, two technician each report different heights.
- 1. Calculate the experimental density of a salt solution and the percent error (same as relative error percent) using some or all the data given below. solubility of NaCl salt in water: 0.357 g/mLmass of empty graduated cylinder: 25.19g mass of graduated cylinder + salt solution: 30.47g total volume of salt solution: 4.98 mLtrue density of salt solution: 1.07 g/mLThree trials for this experiment had been conducted and the following are the masses of limiting reactant: 0.285 grams, 0.299 grams, and 0.292 grams. What is the standard deviation for the masses of limiting reactant for the three trials? please show work on how to do.In order to calibrate a pipet, you obtain the following data: # of drops mL Trial 1 30 0.72 Trial 2 30 0.77 Trial 3 30 0.82 What volume in mL does your pipet deliver per drop?
- A variation of the indicator-dilution method (see preceding problem) is used to measure total blood volume. A known amount of a tracer is injected into the bloodstream and disperses uniformly throughout the circulatory system. A blood sample is then withdrawn, the tracer concentration in the sample is measured, and the measured concentration [which equals (tracer injected)/(total blood volume) if no tracer is lost through blood vessel walls] is used to determine the total blood volume.In one such experiment, 0.60 cm3 of a solution containing 5.00 mg/L of a dye is injected into an artery of a grown man. About 10 minutes later, after the tracer has had time to distribute itself uniformly throughout the bloodstream, a blood sample is withdrawn and placed in the sample chamber of a spectrophotometer. A beam of light passes through the chamber, and the spectrophotometer measures the intensity of the transmitted beam and displays the value of the solution absorbance (a quantity that…Classify whether the following is an Instrumental error, Method error, Personal error, Indeterminate error or Gross error and explain. A group of students are doing an analysis of copper in 1-peso coin. They were tasked to prepare standard solutions and weigh the analyte as the end-product of their experiment. Marikit had very good precision but poor accuracy in her data. Volumetric flasks were placed inside the oven for drying before it was used. Trial 1 and 2 have values close to 30.0 mL while trial 3 gave 55.0 mL. The reagent used in determining copper was added incorrectly and gave a low yield.A series of standards were analyzed which gave the following results SOLUTION % Transmittance 0 mL of 0.100 mg/mL Hg + 2 mL tinchloride in a total volume of 75 mL 100 1.0 mL of 0.100 mg/mL Hg + 2 mL of tinchloride in a total volume of 75 mL 81.3 2.0 mL of 0.100 mg/mL Hg + 2 mL of tinchloride in a total volume of 75 mL 63.9 3.0 mL of 0.100 mg/mL Hg + 2 mL of tinchloride in a total volume of 75 mL 55 5.0 mL of 0.100 mg/mL Hg + 2 mL of tinchloride in a total volume of 75 mL 35.1 How would you make a Beer-Lambert Plot with this information?
