Enthalpy of soluti on measureme nt s of four potassium salts in H20 were made in either an adiabatic or an iso pe ribol cal orimeter or both . The following summari zes the measured and recomme nd ed values: The value for KIO. has bee n corrected for the hydrol ys is of the pe ri odate ion. The .:lC " = -(82. 5 ± 4.3)J · mol -I ·K-1 for the unh ydrolysed reaction. For the reaction of KBr in H20 , .:l C " was measured as -(1 66.6 ± 7.2) ]-,nol -I·K -I in the temperature range 298 K to 3 19 K.Measure ments with the iso peribol calorimeter are also re ported for the e ndothermic reacti on of tri s(h ydrox ymeth yl)aminomethane, SRM 724a, in aqueous NaOH (0.05 mol·L -I).Compari sons of measurement s by different calorim eters on the same samples revea l unid e ntified calorimetri c eITors for e ndothermi c reactions which are greater than the imprec ision of the measurements.
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