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Research Article

Academia Journal of Scientific Research 9(1): 009-018, January 2021
DOI: 10.15413/ajsr.2020.0417
ISSN 2315-7712
2021 Academia Publishing


Concentration determination by means of refractometric method: A consequent dilution of an unknown binary aqueous solution


Accepted 22nd September, 2020

Mihai Petrov

Department of Real Sciences, section of Physics and Mathematics, University "Prof. Asen Zlatarov", Burgas City, Republic of Bulgaria.

The physics-chemical methods of the study are important means of determining the parameters of the researched samples. One of the physics-chemical and in particular optical methods is the refractometric method, which is based on determining the concentrations of the transparent solutions by the measurements of the refractive indexes with technical tools called refractometers. The current situation of the refractometric method is based on the method of standard solutions with known concentrations of the known substance and only the case when the calibration graph is presented then it allows determining the unknown concentration of the investigated solution. The present study proposes a method based on the consequent dilution of the researched binary solution without using any of the standards. A binary solution is a system that consists of two parts: the dissolved substance and the solvent. A part of the volume of the solution is separated into a separate vessel from the given sample of this solution with unknown concentration, and the mass of the separated solution is measured. The initial unknown concentration of the researched solution is the same as for the separated volume. The refractive indexes are measured after each consequent dilution by the addition of the solvent with the same volumes of 2 ml. Finally, the measured data of the refractive indices allow to calculate by the proposed formula in the paper the unknown concentration of the unknown substance of this binary solution. The value of the calculated concentration of the unknown substance is used for further calculating the concentrations of the consecutively diluted solutions. These values of the concentrations finally allow to represent the graph of the refractive indices as the function of the diluted concentrations which validate principly the linearity of the refractive indices as the function of the concentration. Another specific method of mass refractive solvent factor is suggested and performed in this study for the determination of unknown concentration. All the researches are performed at usual room temperature.

Key words: Refractometry, binary aqueous solution, refractive index, dilution, concentration, refractive factor, mass refractive solvent factor.

This is an open access article published under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Cite this article as:


Petrov M (2021). Concentration determination by means of refractometric method: A consequent dilution of an unknown binary aqueous solution. Acad. J. Sci. Res. 9(1): 009-018.

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