Integral heats of solution and enthalpies of ionization of 100% nitric acid at 298 K 3. Aqueous solutions of sulfuric acid containing 70–90% H2SO4 and ionization of HNO3 as a base |
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Authors: | I M Medvetskaya M I Vinnik T S Kon'kova Yu N Matyushin Yu A Lebedev V F Zhilin |
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Institution: | (1) N. N. Semenov Institute of Chemical Physics, Academy of Sciences of the USSR, Moscow |
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Abstract: | The integral heats of solution of 100% HNO3
at
=0.1mole/liter in aqueous solutions of H2SO4 of <90% by wt. were measured. A scheme was proposed and proved for ionization of HNO3 as a base in 82–90% aqueous solutions of H2SO4, according to which un-ionized HNO3 exists in the form of an aqueous solvate H2O-HNO3 and the ionized form as the ion pair NO2
+·HSO4
–. The value of the enthalpy of ionization of nitric acid H (NO2
+ HSO4
–)= H (NO2
+·HSO4
–) drops from 2.05 at 89.99% H2SO4 to 0.18 kcal/mole in 84.07% H2SO4.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 2, pp. 306–310, February, 1990. |
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Keywords: | |
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