Open AccessEnthalpies of solution of Kbr, Ki, Kio3, and Kio4 in H2o
Author(s) -
M.E. Efimov,
G.N. Klevaichuk,
В. А. Медведев,
Marthada V. Kilday
Publication year - 1979
Publication title -
journal of research of the national bureau of standards
Language(s) - English
Resource type - Journals
eISSN - 2376-5259
pISSN - 0160-1741
DOI - 10.6028/jres.084.011
Subject(s) - endothermic process , chemistry , calorimeter (particle physics) , enthalpy , aqueous solution , analytical chemistry (journal) , hydroxymethyl , calorimetry , hydrolysis , nuclear chemistry , chromatography , thermodynamics , organic chemistry , physics , adsorption , detector , optics
Enthalpy of solution measurements of four potassium salts in H 2 O were made in either an adiabatic or an isoperibol calorimeter or both. The following summarizes the measured and recommended values: [Table: see text] The value for KIO 4 has been corrected for the hydrolysis of the periodate ion. The Δ C p = -(82.5 ± 4.3)J·mol -1 ·K -1 for the unhydrolysed reaction. For the reaction of KBr in H 2 O, Δ C p was measured as -(166.6 ± 7.2) J·mol -1 ·K -1 in the temperature range 298 K to 319 K. Measurements with the isoperibol calorimeter are also reported for the endothermic reaction of tris(hydroxymethyl)aminomethane, SRM 724a, in aqueous NaOH (0.05 mol·L -1 ). Comparisons of measurements by different calorimeters on the same samples reveal unidentified calorimetric errors for endothermic reactions which are greater than the imprecision of the measurements.