Explore resources, experiments, and teaching materials shared by the analytical sciences community.
In the EDTA titration for CaO in limestone, the pH of the sample is made sufficiently basic so any magnesium thatis present will precipitate as Mg(OH)2. The adjustment of pH is fairly […]
Once upon a time, a common method for determining phosphorous was to convert it to phosphate, precipitate it as magnesium ammonium phosphate, MgNH4PO4, and ignite it to form magnesium pyrophosphate, Mg2P2O7. The […]
One of the hazards of strip mining is that water passing through the mine’s “tailings” (the piles of discarded material) is often very acidic and contains high concentrations of metal ions, such […]
You may know that there is a growing interest in the ginkgo tree because herbal supplements using extracts of ginkgo are believed to aid in fighting memory loss. A recent paper [Lang, […]
When leaded gasoline was available, automobiles were a significant source of the total yearly environmental emission of Pb. During internal combustion lead in gasoline, which was present as tetraethyl lead, was vaporized. […]
Imagine you have an aqueous sample containing a weak acid analyte, HA, and a weak base interferent, HI. The following information about HA, HI, the method of analysis, and the sample are […]
Carry out the following “experiment” to test the validity of the sampling constant equation mR2 = Ks where m is the sample’s mass, R is the relative standard deviation for sampling, and […]
To determine the concentration of Cu2+ in a sample of water obtained from a local pond, the following solutions were prepared: Solution I: 5.00 mL of sample diluted to 10 mL in […]
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 […]
Mechanical micropipets are commonly used to dispense small (μL) volumes of reagents. A recent “Application Note” [Am. Lab. June 1999] contains the following data for 50 replicate deliveries of a reagent using […]
The %w/w Cu in a synthetic basic copper carbonate may be found by reducing and isolating the copper as Cu metal. To calculate the %w/w Cu we use the following formula The […]
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 […]
