Which of the following is incorrect: a. General steps in quantitative analysis include: Method selection, sampling, sample processing, calibration & measurement. b. Quantitative analytical methods include: gravimetric, volumetric, spectroscopic and electroanalytical methods. c. The first step in sample processing is sample preparation. d. Replication improves the quality of results and their reliability. e. In quantitative analysis there should be a inverse proportionality between a measured property and the concentration or amount of substance. Please fill in the spaces one of the following characters (a or b or e or d or e)

Which of the following is incorrect: a. General steps in quantitative analysis include: Method selection, sampling, sample processing, calibration & measurement. b. Quantitative analytical methods include: gravimetric, volumetric, spectroscopic and electroanalytical methods. c. The first step in sample processing is sample preparation. d. Replication improves the quality of results and their reliability. e. In quantitative analysis there should be a inverse proportionality between a measured property and the concentration or amount of substance. Please fill in the spaces one of the following characters (a or b or e or d or e)

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 A1.14QAP

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analytical balanceb. top-loading balancec. serological pipetted. graduated cylindere. burettef. volumetric flaskg. Erlenmeyer flaskh. beaker Define the term, “measurement uncertainty”. Among the instruments listed above, which ones have the highest uncertainty? Which ones have the lowest?
Which of the following is incorrect: a. General steps in quantitative analysis include: Method selection, sampling, sample processing, calibration & measurement. b. Quantitative analytical methods include: gravimetric, volumetric, spectroscopic and electroanalytical methods. c. The first step in sample processing is sample preparation. d. Replication improves the quality of results and their reliability. e. In quantitative analysis there should be a inverse proportionality between a measured property and the concentration or amount of substance.
Among the instruments listed below, which ones have the highest uncertainty (give one and explain)? Which ones have the lowest (give one and explain)? a. analytical balance b. top-loading balance c. serological pipette d. graduated cylinder e. burette f. volumetric flask g. Erlenmeyer flask h. beaker
(8) Identify whether the following are examples of systematic or random error or are mistakes: a. Using an inaccurately calibrated buret. b. An uncertainty of 1 mg in the weight of your sample.∓ c. Overshooting the endpoint on your first sample, then hitting the endpoint on the remaining samples.d. Failing to let your volumetric pipet drain for a few seconds have most of the liquid has been delivered.
Categorize each as a determinate or an indeterminate error and further classify determinate errors as instrumental, method or personal. a) An unknown sample being weighed is hygroscopic. b) One component of a mixture being analyzed quantitatively by GC reacts with the column packing. c) A radioactive sample being counted repeatedly without any change in condition yields a slightly different count at each trial. 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.
The method described above is to be used for the analysis of ores that assay about 1.2% gold. What minimum sample mass should be taken if the relative error resulting from a 0.4-mg loss is not to exceed a. -0.1% b. -0.8%
1. Samples that should not be stored should be prepared/analyzed as soon as possible, especially for measurement…a. hardnessb. Nitritec. Conductivityd. Phenol 2. The following are general sample treatments in pesticide analysis, except…a. Extractionb. Cleaningc. Concentrationd. Filtering
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