Reaction solvent effect (2): "The ion product"

Shown in Fig.1 is the ion product (the product of the hydrogen ion concentration and the hydroxy-ion concentration) of water. The ion product is defined as Kw=[H⁺][OH^-]; the concentration under the conditions of room temperature and atmospheric pressure will be 1x10^-7mol/l for both. The value of Kw will be 1x10^-14(mol/l)². Under conditions of high temperature and high pressure, the value of the ion product will increase considerably. Under a pressure of 34.5MPa, the maximum value (the minimum value for -logKw) will occur in the vicinity of 300°C, which will be 1x10^-11(mol/l)². In this case, the hydrogen ion concentration will be 3x10^-6mol/l, showing an increase of about 30 times the concentration that occurs under room temperature and atmospheric pressure. This indicates that supercritical water possesses the effect of an acid catalyst.

To Home of supercritical Fluid

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Characteristics and uses of supercritical water

Reaction solvent effect (1): "The dielectric constant"

Applications in hydrolysis reaction