Q_The following results were obtained in the replicate determination of the lead content of a blood sample (0.752, 0.756, 0.752, 0.751 and 0.760 )ppm. Calculate the mean, standard deviation, relative standard deviation%, median, variance and

Q_The following results were obtained in the replicate determination of the lead content of a blood sample (0.752, 0.756, 0.752, 0.751 and 0.760 )ppm. Calculate the mean, standard deviation, relative standard deviation%, median, variance and

Fundamentals Of Analytical Chemistry

9th Edition

ISBN:9781285640686

Author:Skoog

Publisher:Skoog

Chapter16: Applications Of Neutralization Titrations

Section: Chapter Questions

Problem 16.10QAP

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hree components in a mixture have varying distribution constants between the mobile phase and the stationary phass One of the components has a very low distribution constant, Would this component likely elute first or last and how would you design an experiment or modify the components of the separation to make it perform in the opposite manner?
Researchers used gas chromatography to determine the % v/v methyl salicylate in rubbing alcohol [Van Atta, R. E.; Van Atta, R. L. J. Chem. Educ. 1980, 57, 230-231]. A set of standard additions was prepared by transferring 20.00 mL of rubbing alcohol to separate 25 - mL volumetric flasks and pipeting 0.00 mL, 0.20 mL, and 0.50 mL of methyl salicylate to the flasks. All three flasks were diluted to volume using isopropanol. Analysis of the three samples gave peak heights for methyl salicylate of 57.00 mm, 88.5 mm, and 132.5 mm, respectively. Determine the % v/v methyl salicylate in the rubbing alcohol.
The method of internal standard was used to analyze and measure the concentration of chemical X by GC A known mixture of compounds X and Y (internal standard) gave the following chromatographic results: Compound X Y a) 2.0 x 106 M b) 8.4 x 10-7 M c) 6.6 x 10-7 M Concentration (M) 6.3 x 10-8 2.0 x 10-7 d) 4.1 x 10-7 M e) 2.9 x 10-7 M Peak Area Then, an unknown was analyzed as follows. 3.0 mL of unknown X was treated with 0.100 mL of 1.6 x 10-5 MY and the mixture diluted to 10.0 mL final volume. Peak areas were 633 (for X) and 520 (for Y). What is the concentration of X in the unknown. (The original 3.00 sample?) 395 787
The following data was obtained when four bottles of wine, were analyzed for residual sugar content and the results obtained are the followingB Bottles % w/v Residual Sugar 1 0.97, 0.86, 1.02 2 1.25, 1.32, 1.13, 1.20, 1.12 3 0.9, 0.92, 0.73 0.72, 0.77, 0.61,0.58 a) For each set, determine the mean, spread, standard deviation s and coefficient of variation. b) Calculate the pooled standard deviation, spooled. 2.
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1. Calculate the difference in retention volumes for solutes A and B that are passed through a column containing 1.8 mL of stationary phase and 2.7 mL of mobile phase. The distribution coefficients of A and B are 8.5 and 16.8 respetcively.