where Ca and Cb are the analytical (starting) concentration of the acid and base, respectively. Over the past 50 years, chemists have elaborated upon Charlot’s method so that variations upon the “proton accounting” theme are plentiful. The investigators are correct to note that a properly written proton balance equation will not violate the conservation of charge and makes explicit use of charg...

A large fraction of the field of supramolecular chemistry has focused in previous decades upon the study and use of synthetic receptors as a means of mimicking natural receptors. Recently, the demand for synthetic receptors is rapidly increasing within the analytical sciences. These classes of receptors are finding uses in simple indicator chemistry, cellular imaging, and enantiomeric excess an...

This paper describes an application model that couples Analytical Hierarchy Process(AHP) and fuzzy comprehensive evaluation method , which named Fuzzy-AHP(FAHP). AHP has its own superiority in computing index weight and comparing index in the same row than at classifying level. While fuzzy comprehensive evaluation method is good at classifying level. Taking into account their respective advanta...

The problem you need to solve is to determine the identity of the individual components from your mixture. You will use several different techniques today and compare your experimental results to those of known standards. From this data you should be able to identify all of the components of your original mixture. Keep careful records of your observations and your interpretation of spectra so t...

Transition-metal centers are the active sites for a broad variety of biological and inorganic chemical reactions. Notwithstanding this central importance, density-functional theory calculations based on generalized-gradient approximations often fail to describe energetics, multiplet structures, reaction barriers, and geometries around the active sites. We suggest here an alternative approach, d...

Department of Carbohydrate Chemistry and Technology, Institute of Chemical Technology in Prague, Technická 5, 166 28 Prague 6, Czech Republic Department of Analytical Chemistry, Institute of Chemical Technology in Prague, Technická 5, 166 28 Prague 6, Czech Republic Department of Meat Technology and Preservation, Institute of Chemical Technology in Prague, Technická 5, 166 28 Prague 6, Czech Re...

In the title Pb(II) complex, [Pb(2)(C(2)Cl(3)O(2))(2)(NO(3))(2)(C(12)H(8)N(2))(2)](n), the 1,10-phenanthroline ligand is chelating, the nitrate anion chelates one Pb(II) ion and simultaneously bridges a neighbouring Pb(II) ion via the third O atom, and the trichloro-acetate anion is bidentate, bridging two Pb(II) ions. The coordination geometry is based on a penta-gonal-bipramidal geometry defi...