Hypochlorous acid and the hypochlorite anion

Neumann and Muller [29NEU/MUL] extensively studied the enthalpy of the reaction 

The enthalpy of formation of HClO(aq) has also been evaluated from the enthalpy ehange of the reaction HClO(aq) + + 21 l2(cr) + d + H20(l), 

A // (291 K) = - (215.2 + 0.8) kJ-mol measured by Thomsen [I882THO] and of the reaction CljCaq) + H,0(1) HCIO(aq) +H + CP, (298.15 K) = (21.1 +0.5) kJ mol, measured by Connick and Chia [59CON/CHI]. The former quantity was determined by ealorimetry and the latter from the temperature variation of the equilibrium constant of the reaction determined by conductometrie measurements. The enthalpies of formation calculated from the data were respectively. 

The error bars have been increased to include the uncertainty from the influence of temperature. The selections lead to an enthalpy change of the reaction 

The determinations of the enthalpy of dilution of HCIO(aq) in [29NEU/MUL] indicate that it is negligible for solutions more dilute than HC10(aq, 1 200). 

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