Constant autoionization

Kw is also widely called the autoionization constant and sometimes the ion product constant of water. 

The autoprotolysis constant (autoionization constant) of water, Kw = q(l l jO )q(OI1 ) ss [H30+][0H, is often called the ion product constant of water. The value of -logKw varies with temperature as in Table 3.2. In water, there exists the following relation between K l of an acid and Kb of its conjugate base ... 

The "equilibrium boxes" for the solvents (Fig. 10-1) indicate the range over which differentiation occurs outside the range of a particular solvent, all species are leveled. For example, water can differentiate species (i.e., they are weak adds and bases) with pKa s from about 0 to 14 (such as acetic acid). Ammonia, on the other hand, behaves the same toward acetic acid and sulfuric acid because both lie below the differentiating limit of —12. The extent of these ranges is determined by the autoionization constant of the solvent (e.g, —14 units for water). The acid-base behavior of several species discussed previously may be seen to correlate with Fig. 10.1.11... 

ATw is known as the autoionization constant of water, and is sometimes identified as the ion product of water. The magnitude of ATw is very small, being equal to 1.007 x 10 " at a temperature of 25°C.i i For the sake of convenience, Sprensen proposed the p scale, where numbers such as AT would be... 

Fig. 1 Temperature dependence of the autoionization constant of water. (From Ref...

In Equation 10.1, is the second-order rate constant for the bimolecular reaction in the rate-limiting step, K is the dissociation constant of the imidazolium cation, and is the autoionization constant... 

Temperature Dependence of the Autoionization Constant of Water (fCJ and the pH of Neutrai Water... 

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