Affiliation:
1. Tianjin Key Laboratory of Marine Resources and Chemistry , College of Chemical Engineering and Materials Science, Tianjin University of Science and Technology , Tianjin 300457 , P.R. China
2. School of Chemistry Engineering, Linyi University , Linyi 276000 , P.R. China
3. Tianjin Key Laboratory of Marine Resources and Chemistry , College of Chemical Engineering and Materials Science, Tianjin University of Science and Technology , Tianjin 300457 , P.R. China , Tel./Fax: +86-22-60602963
Abstract
Abstract
Densities of the sodium arsenate aqueous solution with the molality varied from (0.04165 to 0.37306) mol · kg−1 were determined experimentally at temperature intervals of 5 K from 283.15 K to 363.15 K and ambient pressure using a precise Anton Paar Digital vibrating-tube densimeter. The apparent molar volumes (V
ϕ
), thermal expansion coefficient (α) and partial molar volume
(
V
¯
B
)
$({\bar V_{\rm{B}}})$
were obtained based on the results of density measurement. The 3D diagram of apparent molar volume against temperature and molality as well as the diagram of thermal expansion coefficient and partial molar volume against molality were plotted, respectively. On the basis of the Pitzer ion-interaction equation of apparent molar volume model, the Pitzer single-salt parameters (
(
β
M,X
(
0
)
v
,
β
M,X
(
1
)
v
,
β
M,X
(
2
)
v
and
C
M,X
v
,
M
X
=
N
a
3
A
s
O
4
)
$(\beta _{{\rm{M,X}}}^{(0)v},\beta _{{\rm{M,X}}}^{(1)v},{\rm{ }}\beta _{{\rm{M,X}}}^{(2)v}{\rm{ and }}C_{{\rm{M,X}}}^v,MX = N{a_3}As{O_4})$
and their temperature-dependent correlation F(i, p, T) = a
1 + a
2ln(T/298.15) + a
3(T – 298.15) + a
4/(620 – T) + a
5/(T – 227) (where T is temperature in Kelvin, a
i
is the correlation coefficient) for Na3AsO4 were obtained on account of the least-squares method. Predictive apparent molar volumes agree well with the experimental values, and those results indicate that the single-salt parameters and their relational coefficients of temperature-dependence for Na3AsO4 obtained are reliable.
Subject
General Chemical Engineering,General Chemistry
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