ISSN:
1572-8927
Keywords:
Ion pair
;
rubidium nitrate
;
thallium(I) nitrate
;
density
;
apparent molal volume
;
magnetic float
;
electrolyte solution
;
electrostriction
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
Abstract Density data for dilute aqueous solutions of RbNO 3 and TlNO 3 at 25°C lead to the following equations for the apparent molal volumes: RbNO3: ΦV = 43.07 + 2.46c 1/2 + 0.15c (0−0.41M) TINO3: ΦV = 39.50 + 10.83c 1/2 − 25.46c + 26.0c 3/2 (0.03−0.25M) From these expressions and a semiempirical equation for Φv of a completely dissociated 1:1 electrolyte, values of ΔΦv for ion pair formation at c=0.10 are calculated to be+5 ml-mole−1 for RbNO 3 and+12 ml-mole−1 for TlNO 3 . Comparison of ΔΦv with the electrostriction volume effect suggests that virtually all of the electrostriction is removed in the formation of the TlNO 3 ion pair but only about half with RbNO 3 . Values of ΔΦv are in poor agreement with those estimated from electrostatic theories of ion pair formation.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00646879
