Volume change of ion pair formation: Rubidium nitrate and thallium(I) nitrate in water

William L. Masterton; Harry Welles; Jonathan H. Knox; Frank J. Millero

doi:10.1007/BF00646879

Volume change of ion pair formation: Rubidium nitrate and thallium(I) nitrate in water

William L. Masterton, Harry Welles, Jonathan H. Knox, Frank J. Millero

Ocean Sciences

Research output: Contribution to journal › Article › peer-review

28 Scopus citations

Abstract

Density data for dilute aqueous solutions of RbNO₃ and TlNO₃ at 25°C lead to the following equations for the apparent molal volumes: RbNO₃: Φ_V = 43.0₇ + 2.46 c^1/2 + 0.15 c (0-0.41 M) TINO₃: Φ_V = 39.5₀ + 10.83 c^1/2 - 25.46 c + 26.0 c^3/2 (0.03-0.25 M) From these expressions and a semiempirical equation for Φ_v of a completely dissociated 1:1 electrolyte, values of ΔΦ_v for ion pair formation at c=0.10 are calculated to be+5 ml-mole^-1 for RbNO₃ and+12 ml-mole^-1 for TlNO₃. Comparison of ΔΦ_v with the electrostriction volume effect suggests that virtually all of the electrostriction is removed in the formation of the TlNO₃ ion pair but only about half with RbNO₃. Values of ΔΦ_v are in poor agreement with those estimated from electrostatic theories of ion pair formation.

Original language	English (US)
Pages (from-to)	91-102
Number of pages	12
Journal	Journal of Solution Chemistry
Volume	3
Issue number	2
DOIs	https://doi.org/10.1007/BF00646879
State	Published - Feb 1 1974

Keywords

Ion pair
apparent molal volume
density
electrolyte solution
electrostriction
magnetic float
rubidium nitrate
thallium(I) nitrate

ASJC Scopus subject areas

Biophysics
Biochemistry
Molecular Biology
Physical and Theoretical Chemistry

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title = "Volume change of ion pair formation: Rubidium nitrate and thallium(I) nitrate in water",

abstract = "Density data for dilute aqueous solutions of RbNO3 and TlNO3 at 25°C lead to the following equations for the apparent molal volumes: RbNO3: ΦV = 43.07 + 2.46 c1/2 + 0.15 c (0-0.41 M) TINO3: ΦV = 39.50 + 10.83 c1/2 - 25.46 c + 26.0 c3/2 (0.03-0.25 M) 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 RbNO3 and+12 ml-mole-1 for TlNO3. Comparison of ΔΦv with the electrostriction volume effect suggests that virtually all of the electrostriction is removed in the formation of the TlNO3 ion pair but only about half with RbNO3. Values of ΔΦv are in poor agreement with those estimated from electrostatic theories of ion pair formation.",

keywords = "Ion pair, apparent molal volume, density, electrolyte solution, electrostriction, magnetic float, rubidium nitrate, thallium(I) nitrate",

author = "Masterton, {William L.} and Harry Welles and Knox, {Jonathan H.} and Millero, {Frank J.}",

year = "1974",

month = feb,

day = "1",

doi = "10.1007/BF00646879",

language = "English (US)",

volume = "3",

pages = "91--102",

journal = "Journal of Solution Chemistry",

issn = "0095-9782",

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TY - JOUR

T1 - Volume change of ion pair formation

T2 - Rubidium nitrate and thallium(I) nitrate in water

AU - Masterton, William L.

AU - Welles, Harry

AU - Knox, Jonathan H.

AU - Millero, Frank J.

PY - 1974/2/1

Y1 - 1974/2/1

N2 - Density data for dilute aqueous solutions of RbNO3 and TlNO3 at 25°C lead to the following equations for the apparent molal volumes: RbNO3: ΦV = 43.07 + 2.46 c1/2 + 0.15 c (0-0.41 M) TINO3: ΦV = 39.50 + 10.83 c1/2 - 25.46 c + 26.0 c3/2 (0.03-0.25 M) 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 RbNO3 and+12 ml-mole-1 for TlNO3. Comparison of ΔΦv with the electrostriction volume effect suggests that virtually all of the electrostriction is removed in the formation of the TlNO3 ion pair but only about half with RbNO3. Values of ΔΦv are in poor agreement with those estimated from electrostatic theories of ion pair formation.

AB - Density data for dilute aqueous solutions of RbNO3 and TlNO3 at 25°C lead to the following equations for the apparent molal volumes: RbNO3: ΦV = 43.07 + 2.46 c1/2 + 0.15 c (0-0.41 M) TINO3: ΦV = 39.50 + 10.83 c1/2 - 25.46 c + 26.0 c3/2 (0.03-0.25 M) 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 RbNO3 and+12 ml-mole-1 for TlNO3. Comparison of ΔΦv with the electrostriction volume effect suggests that virtually all of the electrostriction is removed in the formation of the TlNO3 ion pair but only about half with RbNO3. Values of ΔΦv are in poor agreement with those estimated from electrostatic theories of ion pair formation.

KW - Ion pair

KW - apparent molal volume

KW - density

KW - electrolyte solution

KW - electrostriction

KW - magnetic float

KW - rubidium nitrate

KW - thallium(I) nitrate

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Volume change of ion pair formation: Rubidium nitrate and thallium(I) nitrate in water

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