RAMAN SPECTROSCOPIC STUDY OF AQUEOUS (NH4)2SO4 AND ZnSO4 SOLUTIONS

Authors
  1. Hayes, A.C.
  2. Kruus, P.
  3. Adams, W.A.
Corporate Authors
Defence Research Establishment Ottawa, Ottawa ONT (CAN);Carleton Univ, Ottawa ONT (CAN) Dept of Chemistry
Abstract
The Raman spectra of the v sub 1-SO4 2(-) band in 0.5-2.5 molar aqueous (NH4)2SO4 and ZnSO4 solutions in the temperature range 25-85C were studied. The molar scattering coefficient of the v sub 1 band is the same for all forms of sulfate in (NH4)2SO4 and ZnSO4 solutions and is independent of temperature up to 85C. The v sub 1 band profile is symmetrical in (NH4)2SO4 solutions. In ZnSO4 solutions, a shoulder appears on the high frequency side which increases slightly in intensity with increasing concentration and temperature. This high frequency component is attributed to the formation of the contact pair (Zn 2(+).SO4 2(-)). The enthalpy of formation for the contact ion pair is estimated from the Raman data to be approximately 3kJ0mo1(-) which is in reasonable agreement with measurements by other methods.
Date of publication
15 Oct 1983
Number of Pages
16
Reprinted from
J of Solution Chemistry, vol 13, no 1, 1984, p 61-74
DSTKIM No
86-03542
CANDIS No
98222
Format(s):
Hardcopy;Originator's fiche received by DSIS

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