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accuracy acid-base acid-base titration amino acid back-titration calibration curve chemical reactivity complexation titration concentrations confidence interval derivative titration curve determinate error dilution dimensional analysis end point equivalent weight external standardization extraction graphing indeterminate error interferent ion-exchange chromatography ion-selective electrode ladder diagram mean median method development mixtures non-aqueous precision propagation of error quantitative analysis repeatability reproducibility sampling constant sampling plan selectivity selectivity coefficient solubility standard addition standard deviation standards student-generated data t-test titration curve### Archives

### Ratings

- Using a Control Chart to Detect Problem in Analysis (5.00 out of 5)
- Kinetic Determination of Ascorbic Acid (0.00 out of 5)
- Gravimetric Method for Analysis of Phosphorous: Analysis of Procedure (0.00 out of 5)
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- Analysis of a Digital Pipet (0.00 out of 5)
- Analysis of Basic Copper Carbonates (0.00 out of 5)
- Determination of Fat in a Snickers’ Bar (0.00 out of 5)
- Spike Recovery for Analysis of Ginkgolide (0.00 out of 5)
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# Tag Archives: concentrations

## Analysis of Pb in Biological and Environmental Samples

A paper by Yan, et. al. [Yan, X.-P.; Sperling, M.; Welz, B. Anal. Chem. 1999, 71, 4216-4222] describes a newly developed analytical method for the analysis of biological and environmental samples containing Pb2+ in the presence of a variety of … Continue reading

## Determination of Fat in a Snickers’ Bar

In a recent paper [J. Chem. Educ. 1997, 74, 1108-1111], Snow, Dunn and Patel describe the experimental determination of fat in a SnickersTM candy bar. The fat was removed by extraction with supercritical CO2, with the sample weighed before and … Continue reading

Posted in Calculation, Essay Question, Statistics
Tagged concentrations, confidence interval, mean, precision, standard deviation
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In determining the concentration of HCl by titrating against the primary weak base TRIS, the molarity of HCL is calculated using the following equation where GFW is the gram formula weight of TRIS, which is 121.136 g/mol. (a) Calculate the … Continue reading

Posted in Calculation, Error Analysis, Essay Question
Tagged concentrations, dimensional analysis, propagation of error
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## Preparing Solutions

During lab you need to prepare a solution that is 5.00 x 10-2 M Fe(CN)63- using K3Fe(CN)6. (a) Explain how to make 500 mL of this solution so that you know its concentration exactly. (b) If you transfer 5.00 mL … Continue reading

## Concentration of Parathion Solutions

Parathion, C10H16NO5PS, is a toxic organophosphorous pesticide. A recently published method [Sacks, et al. Anal. Chem. 2000, 72, 2055-2058] for parathion reports a detection limit of 10 ng/mL. Express this concentration in ppm and molarity.

## Concentrations

Gratzel et. al. [Anal. Chem. 1999, 71, 2751-2756] describe the use of a diffusional microburet to transfer solutions to very small droplets of solvent. The purpose of their work is to run conventional analyses, such as titrations, on an extremely … Continue reading