Determination of microquantities of thiosulfate by kinetic method
I V Pulyayeva1, N L Yegorova, L P Experiandova
1Institute for Single Crystals, National Academy of Sciences of Ukraine, 60 Lenin Ave., 310001 Kharkov, Ukraine.
Abstract:
A new redox indicator reaction between Cu(2+), Mn(2+) and S(2)O(3)(2-) in the presence of 2,2'-bicinchoninic acid is investigated. Optimum reaction conditions are determined. The influence of nonaqueous solvents on the reaction rate is studied. It is shown that in the presence of acetone the S(2)O(3)(2-) determination limit is lowered 0.005 mug ml(-1). Random errors lie within the limits allowable at the determination of microconcentrations. To raise the sensitivity of the determination of S(2)O(3)(2-) in some inorganic salts (KCl, KNO(3), CsNO(3)), this impurity was concentrated by low-temperature directed crystallisation. Metrologic characteristics of the developed technique are presented.
More Related Videos
Related Concept Videos
Preparation and Reactions of Thiols
Redox Titration: Iodimetry and Iodometry
Precipitation of Ions
The equation that describes the equilibrium between solid calcium carbonate and its solvated ions is:
Rate-Determining Steps
In a multistep reaction mechanism, one of the elementary steps progresses significantly slower than the others. This slowest step is called the rate-limiting step (or rate-determining step). A reaction cannot proceed faster than its slowest step, and hence, the rate-determining step limits the overall reaction rate.
The concept of rate-determining step can be understood from the analogy of a 4-lane freeway with a short-stretch of traffic-bottleneck caused due to...
Precipitation Titration: Endpoint Detection Methods
In the Volhard method, a standard excess of AgNO3 is first added to the...
SN2 Reaction: Kinetics
In a chemical reaction, a relationship exists between the concentration of reactants and the rate at which the reaction proceeds. The study to measure this relationship is known as the kinetics of a chemical reaction. Kinetic studies are used to deduce the rate law of a chemical reaction, which provides information about the species involved during the transition state of the rate-determining step. Thus, kinetic studies help to derive the mechanism of a reaction.


