CONDUCTIVITY OF AMINOMETHANESULPHONIC ACIDS N-DERIVATIVES AQUEOUS SOLUTIONS

Autor: R. E. Khoma, A. N. Chebotaryov, K. N. Kalarash, L. T. Osadchiy
Jazyk: English<br />Russian<br />Ukrainian
Rok vydání: 2018
Předmět:
Zdroj: Vìsnik Odesʹkogo Nacìonalʹnogo Unìversitetu: Hìmìâ, Vol 23, Iss 3(67), Pp 16-28 (2018)
Druh dokumentu: article
ISSN: 2304-0947
2414-5963
DOI: 10.18524/2304-0947.2018.3(67).140798
Popis: Conductometric and pH-metric studies of the electrochemical properties of aqueous solutions (1∙10-4 ÷ 9∙10-3 М) of five aminomethanesulphonic acid N-alkylated derivatives (YAMSA) were carried out in the temperature range 293 ÷ 313 K. N-methylaminomethanesulphonic acid (MeAMSA), N-(2-hydroxyethyl)aminomethanesulphonic acid (HEAMSA), N-(n-butyl) aminomethanesulphonic acid (n-BtAMSA), N-(tert-butyl)aminomethanesulphonic acid (t-BtAMSA) and N-benzylaminomethanesulphonic acid (BzAMSA) were used in research. From the results of the conductometric studies of YAMSA – H2O systems it was stated the temperature increase from 293 to 313 K was accompanied by systems molar electrical conductivity increase due to the increase of electrolytes dissociation degree and/or the mobility of the ions formed. Simultaneously for all the systems studied, the acid properties increased with temperature increasing from 293 to 308 K. The limiting electrical conductivity values were calculated by extrapolating according to Shidlovskiy. With considering of the previously published results of the aminomethanesulfonic acid (AMSA) aqueous solutions conductometric study, it was established that the aminomethanesulfonic acids aqueous solutions limiting molar electrical conductivity decreased at 298 K in a series: AMSA (5,75) > BzAMSA (8,76) > HEMSA (9,36) > n‑BtАМSA (9,98) > t‑BtАМSA (9,96) > MeAMSA (9,67). The presented aminomethanesulfonic acids range correlated with their strength (in parentheses – pKYAMSA) A relative decrease of hydrogen ions mobility in HEMSA, n‑BtАМSA, t‑BtАМSA and MeAMSA solutions towards the mobility value for the transport of water H-bonds, as well as the decrease of hydroxyl ions mobility in HEMSA solutions were noted. The compensating effects in the aminomethanesulfonic acid – water systems molar electrical conductivity activation parameters in the temperature range 293 ÷ 313К were noted.
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