IIARD International Institute of Academic Research and Development

INTERNATIONAL JOURNAL OF CHEMISTRY AND CHEMICAL PROCESSES (IJCCP )

E-I SSN 2545-5265
P- ISSN 2695-1916
VOL. 8 NO. 1 2022
DOI: https://doi.org/10.56201/ijccp.v8.no1.2022.pg65.71

---

Differential Temperature Modelling (DTM) for the Determination of Molecular Masses of Strong Acids (Per Chloric and Sulphuric Acids)

Odokwo, E.O. and Ogunyemi, B.T.

---

Abstract

The molecular masses of two (2) strong acids: per chloric (HClO 4 ) and sulphuric (H 2 SO 4 ) have been determined using an experimental guided thermochemical model. The exothermic spree of strong acids was exploited at various percentage dilutions ranging from 10% to 50% using standard procedures. The differential temperature, ?T and other thermochemical parameters (basic constants, kb 2 and thermohydrobasic constants, ?T- 18kb 3 ) were measured and theoretically manipulated. The ?T (HClO 4 ) / o C: 6.0, 11.0, 18.0, 22.0, 27.0 and ?T (H 2 SO 4 ) / o C: 20.0, 48.5, 56.0, 72.0, 84.0 at constant pressure and volume, showed a steady increase in differential temperature within the percentage dilution range. The basic constants: 0.051, 0.093, 0.152, 0.185, 0.228 were obtained for per chloric acid and 0.149, 0.361, 0.417, 0.536, 0.625 were obtained for sulpuric acid at constant pressure and volume. The thermohydrobasic constants: 5.082, 9.326, 15.264, 18.670, 22.896 were obtained for per chloric acid and 14.643, 35.509, 41.001, 52.716, 61.501 were obtained for sulpuric acid at constant pressure and volume. The inverse of the gradient of the plot of basic constants, Kb 2 versus thermohydrobasic constants, ?T – 18Kb 3 affords the molecular masses of 101.00±0.51 a.m.u and 98.04±0.04 a.m.u for per chloric acid and sulphuric acid respectively.

keywords:

Differential Temperature Model (DTF), Thermochemical constants, Molecular masses, Strong acids

---

References:

Akpan, I. A. (2015). Determination of molecular mass of strong acids by Differential Temperature Model
(DTM) using H 3 PO 4 and HBF 4 for Classical Demonstration. Journal of Material Science and
Chemical Engineering. 3, 41-47.

Pleil, J.D. and Isaac, K.K. (2016). High-Resolution Mass Spectrometry: Basic Principles for Using Exact
Mass and Mass Defect for Discovering Analysis of Organic Molecules in Blood, Breath, Urine
and Environmental Media. J. Breath Res.10, 1-11.

Morentes, E. and Grusak, M.A. (1998). Mass Determination of Low-Molecular-Weight Protein Phloem
Sap Using Matrix-Assisted Laser Desorption/Ionization Time-of-Flight Mass Spectrometry.
Journal of Experimental Botany. 49 (322), 903-911.

Little, J.L., Williams, A.J., Pshenichnor, A. and Tkachenko, V. (2012) Identification of “Known and
Unknowns” Utilizing Accurate Mass Data and Chemspider. Journal of The American Society for
Mass Spectrometry. 23 (1), 179-185.
Ibrahim, F.M. (2015). Determination of molecular weight of synthetic sugars by measuring the freezing
point depression (colligative peoperties). IJSR, 6(9),1229-1231.
Ge, X. and Wang, X. (2009). “ Estimation of Freezing Point Depression, Boiling Point Elevation And
Vaporization Enthalpies Of Electrolyte Solutions”. Industrial and Engineering Chemistry
Research. 48 (10), 5123-5123.

Atkins, P and de Paula, J. (2006). Physical Chemistry for the Life Sciences. New York: W.H. Freeman Company.

Ebbing, D.D. and Gammon, S.D. (2009). General chemistry (9th edition). Boston: Houghton Mifflin Company.

Sharma, K.K. and Sharma, L.K. (1999). A Textbook of Physical Chemistry (4th Revised Edition). India:
Vikas publishing House, PVT Ltd.

Parsons, J., Holmes, J. B., Rojas, J. M., Tsai, J. and Strauss, C. E. (2005). Practical Conversion from
torsion space to cartesian space for in Silico protein synthesis. J Comput Chem. 26, 1063-1068.

DOWNLOAD PDF

---

Back