precursorsMihai -Cosmin PASCARIU “Vasile Goldiș” Western University of Arad; INCEMC Timișoara; “Chemeia Semper” Association Andrei V. RACU INCEMC… [610282]

ADVANCED OXIDIC
SYSTEMS FROM
HETEROPOLYNUCLEAR
COORDINATION
COMPOUNDS
A semi
–
automated
method for water
content assay in
precursorsMihai -Cosmin PASCARIU
“Vasile Goldiș” Western University of Arad;
INCEMC Timișoara;
“Chemeia Semper” Association
Andrei V. RACU
INCEMC Timișoara;
Institute of Applied Physics of the Academy of
Sciences of Moldova , Chișinău
Ioana -Ramona CIOPĂNOIU
“Vasile Goldiș” Western University of Arad
Carmen -Manuela PLEȘA
“Vasile Goldiș” Western University of Arad
Alfa Xenia LUPEA
“Vasile Goldiș” Western University of Arad
Mircea NICULESCU
University Politehnica Timișoara;
“Chemeia Semper” Association
THE ACADEMIC
DAYS OF
ARAD
27
TH
EDITION
MAY
18
–
20, 2017
–
ARAD

Metal nitrates
Aluminium nitrate is a white, water –
soluble salt of aluminium and nitric
acid, most commonly existing as the
crystalline hydrate, aluminium nitrate
nonahydrate, Al(NO3)3·9H2O. Solid,
white crystals, hygroscopic .
Magnesium nitrate is a hygroscopic
salt with the formula Mg(NO3)2. In air, it
quickly forms the hexahydrate with the
formula Mg(NO3)2·6H2O.

FTIR

Annealing

Melnikov P, Nascimento VA, Consolo LZZ, Silva AF. Mechanism of thermal
decomposition of yttrium nitrate hexahydrate, Y(NO3)3·6H2O and
modeling of intermediate oxynitrates. J. Therm. Anal. Calorim. (2013 )
111: 115-119, doi:10.1007/s10973 -012-2236 -3Thermogravimetry

Calculus

Variables:
Input (theoretical): metal valence ( v), molar
mass of hydrate ( μh), molar mass of
anhydrous nitrate ( μa)
Input (experimental): initial mass of sample
(mi), final mass of sample (mf)
Output: determined number of water
molecules ( x), corrected molar mass of
hydrate ( μ)
Others (computed, intermediate): atomic
mass of metal ( Ar), molar mass of final oxide
(μo), theoretical number of water molecules
(xt), mass of anhydrous nitrate ( ma)
Algorithm

Calculation steps
Ar= μa–v· μ(NO3), where v= 1 ÷3 and
μ(NO3) = 62.0049
μo= Ar+ Ar(O) if v= 2, or μo= 2 · Ar+ v· Ar(O)
if v ≠ 2, where Ar(O) = 15.999
xt= (μh–μa) / μ(H2O), where μ(H2O) =
18.0152833
ma= mf· μa/ μoif v = 2, or ma= mf· μa/ (μo/
2) if v ≠2
x= ((mi–ma) / μ(H2O)) / ( ma/ μa), where
μ(H2O) = 18.0152833
μ= μa+ x· μ(H2O), where μ(H2O) = 18.0152833Equations

Results

XRD

XRD

XRD

Results

Results
Wright S, Tran T, Chen C, Olivares R, Sun S. Thermal stability of potassium and sodium nitrate
molten salt mixtures above 500 °C, 2012 , http://www.pyro.co.za/MoltenSlags2012/W074.pdf

REFERENCES
1. Niculescu M., Pascariu M.C ., Muntean C., Sasca V., Lupa L., Milea M.S.,
Birzescu M . Thermal and spectroscopic analysis of Co(II) –Fe(III) polyglyoxylate
obtained through the reaction of ethylene glycol with metal nitrates . J. Therm.
Anal. Calorim. (2017 ), doi: 10.1007/s10973 -016-6079 -1.
2. Merck Index, 13thed., 2001 .
3. IUPAC. Compendium of Chemical Terminology , 2nded. (the "Gold Book").
Compiled by A. D. McNaught and A. Wilkinson. Blackwell Scientific
Publications, Oxford ( 1997 ). XML on -line corrected version:
http://goldbook.iupac.org ( 2006 -) created by M. Nic, J. Jirat, B. Kosata;
updates compiled by A. Jenkins .
4. Armarego W.L.F., Chai C.L.L. Purification of Laboratory Chemicals , 7th
edition, Elsevier, Amsterdam, 2013 .Literature