Suppose Megan needs to transfer 5.00 mL of a liquid with high precision and accuracy. Which of thefollowing pieces of glassware should Megan use?Hint: Compare the average percent errors, calculated from the sample data provided, for the buret andpipet trials.5-mL pipet25-mL buret10-mL graduated cylinderO 10-ml pipet Suppose Marcus needs to transfer 11.50 mL of a liquid with ONLY high precision. Which of the followingpieces of glassware provided in the General Chemistry labs (see Appendix A) should Marcus use?Hint: Compare the average percent errors, calculated from the sample data provided, for the buret andpipet trials.O 1.50-mL pipet25-mL buretO 10-mL pipet with a little over the calibration lineO 100-mL beaker

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Answered: Suppose Megan needs to transfer 5.00 mL…

Principles of Instrumental Analysis

7th Edition

ISBN:9781305577213

Author:Douglas A. Skoog, F. James Holler, Stanley R. Crouch

Publisher:Douglas A. Skoog, F. James Holler, Stanley R. Crouch

ChapterA1: Evaluation Of Analytical Data

Section: Chapter Questions

Problem A1.3QAP

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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/mL
Give two examples of the Scale Factor Error (one of the types of systematic error). Please do not give what is already given in the example. I need it ASAP Thank you
A method to determine an antibiotic was developed and validated in a pharmaceutical company. The method allows analysis of 100 mg tablets containing 7.5 mg of the antibiotic. According to the validation data, the confidence limits are 7.50 mg± 0.04mg. How many samples will need to be analyzed for an analyst to ensure that the content of the antibiotic in a macerated sample of that drug is 7.50 mg ± 0.03 mg with 95% reliability when analyzing 100 mg of the macerated sample?
(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…
Answer in scientific notation with appropriate sigfigs. A drink mix sample is prepared by mixing a packet of beverage powder in a gallon (3.78 L) of water. A sample for analysis is prepared by diluting 10.00 mL of this solution in a 50.0 mL volumetric flask. When measured using a colorimeter, this diluted solution has an absorbance of (3.49x10^-1). The calibration curve for the experiment yielded a linear fit of y = (2.650x10^4)x+(4.215x10^-2) and an R2 value of 0.9911. Determine the molar concentration of food dye in the sample.
Answer the question in full details: Is it possible for a volumetric pipette to have a high precision but low accuracy? How could this situation arise?
Express 20,000ppb as a percentage strength A. 2% B. 0.02% C. 0.00002% D. 0.002%
Indicate which of the following are determinate and indeterminate errors. a. A hygroscopic sample is not dried in the oven prior to weighing.b. The burette reading of 28.43 mL is written downs to 28.34 mL.c. The bottom of the meniscus in the burette is estimated to be at the zero-milliliter mark but in fact, is very slightly below this mark.d. The liquid in a 10 mL TD pipet is blown out by mouth.e. The rest point of a meter needle, oscillating due to some desktop vibration, is estimated incorrectly.
For devices in which variable volumes can be measured “by eye”, you are entitled to estimate (interpolate) between the finest divisions of any scale on the device. For a graduated cylinder, the finest division is 0.2 mL, for the beaker, it is probably greater than 1 mL,. The volumetric pipetter is not a variable volume device; it only measures the indicated volume; for a 10 mL pipette at the index mark, it is accurate to 0.01 mL What should you write in your lab notebook if you measure 10 mL of a liquid as accurately as you can by eye using each of these devices? a) graduated cylinder b) beaker c) volumetric pipette
Two aqueous hydrogen bromide solutions containing 1.00 wt% HBr (SG=1.0041) and 60.0 wt% HBr (SG=1.6731) are mixed to form a 3.54 M HBr solution (SG=1.1935). What feed rate of the 60.0 wt% HBr solution would be required to produce 1350 kg/hr of product?
You are checking the accuracy of a volumetric flask marked 10.00 mL . To calculate the volume of water contained in the flask, you first measure the mass of the empty flask and the mass of the flask filled with water and take the difference. Then, you correct for the buoyancy factor and divide by the density of the water. The result of 8 such measurements is given in the table. Calculate the 95% confidence interval for these measurements with a mean of 10.03.
The torsion prescription balance has a sensitivity requirement of 0.004 g. and an error of not more than 5%. What is the Minimum measurable quantity?

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