Densities
and isobaric heat capacities of about 25 aqueous solutions
of magnesium perchlorate, Mg(ClO4)2(aq), have
been measured at concentrations 0.01 ≲ m/mol·kg–1 ≲ 2.5 using vibrating tube densimetry and
flow calorimetry, respectively. Densities were determined at temperatures
from 293.15 to 343.15 at 5 K intervals, but heat capacities were restricted
to 298.15 K. These data were used to calculate the corresponding apparent
molar volumes, V
ϕ, and isobaric
heat capacities, C
pϕ, which were extrapolated to infinite dilution using appropriate
semi-empirical equations to give the standard-state values, V° and C
p
°. Where comparisons
were possible, the present results are in good agreement with literature
data but are more extensive and precise. Standard values for Mg2+(aq) were obtained using appropriate extrathermodynamic assumptions
and also agreed well with literature estimates. Unlike many inorganic
salts, the V° values for Mg(ClO4)2(aq) do not show a maximum over the investigated temperature
range.
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