Titrimetric Analysis of Chloride Concentration in Beers using Synthetic Mercury(II) Compound

Abstract

The monothiocyanato-mercuric(II) nitrate [Hg(SCN)NO3] reagent has been prepared synthetically in an aqueous medium and subjected for studies of titrimetric analysis of chloride concentration in beers. In this studies, a measured volume of beer sample was added into known and an excess amount of Hg(SCN)NO3 reagent and the surplus Hg(SCN)NO3 was determined by back titration against standard potassium thiocyanate (KSCN) solution using ferric nitrate [Fe(NO3)3] indicator. The chloride ion and Hg(SCN)NO3 were found to be reacting in the 1:1 stoichiometric ratio. The amount of chloride in beer was determined with the amount of Hg(SCN)NO3 utilized in the titration reaction. The presence of organic and inorganic materials had no effect on the titrimetric assay of chloride concentration in beers as proved by the chloride recovery experiment. The statistical analysis of results showed average standard deviation of 0.01034 and average relative error 1.12%, which indicates the accuracy of the procedure.

Directed assembly of fullerenols via electrostatic and coordination interactions to fabricate diverse and water-soluble metal cation–fullerene nanocluster complexes

“…HgCl 2 as a pseudo salt is a weakly ionized covalent compound that mainly exists in the form of HgCl 2 molecules in dilute solution with no more than 3% ionization. 42,43 Only a very small amount of HgCl 2 was ionized as [HgCl] + , Hg 2+ , and Cl − ions. Since there is electrostatic repulsion between [HgCl] + and Hg 2+ with IFQA , the resulting complex should be the HgCl 2 – IFQA coordination complex formed by HgCl 2 molecules binding directly to IFQA .…”

“…10c). The sufficiently stable [HgCl 3 ] − and [HgCl 4 ] 2− can be simultaneously formed in the presence of an excess amount of Cl − in HgCl 2 solution, 43 which turned into electrostatic attractions between anions containing mercury and IFQA . These anions will be attached to cationic IFQA and subsequently, it can possibly lead to the generation of the water-insoluble [HgCl 3 ] − – IFQA and/or [HgCl 4 ] 2− – IFQA coordinated complexes.…”

“…10b), which is attributed to the weak electrolyte property of mercuric chloride that results in it being dominantly formed as HgCl 2 molecules rather than Hg 2+ ions (<3%) in aqueous solutions. 42,43 Moreover, the insoluble hybrids were observed to fall out of solution when IFQA was added into the solution containing metal anions. As shown in Fig.…”