Ion-product constant of water

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

Km Kw Ki Ki e Michaelis constant (Chapter 10, k-Jki or equation 10.2-17) ion-product constant of water, equation 8.2-4 k-2lk2 (Chapter 10) k-ilki (Chapter 10) liquid (phase) length of unreacted zone (core) in SCM, m... 

At 25°C the concentrations of hydronium and hydroxide ions in water are both equal to 1.0 X 10 M. To put this concentration into perspective, consider that about two out of every billion water molecules dissociates into ions. The equilibrium constant for the above reaction is known as the ion product constant of water, symbolized by K, and is equal to the product of the H+ and OH molar concentrations ... 

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 ... 

Clever, H. L., The Ion Product Constant of Water Thermodynamics of Water Ionization. J. Chem. Educ., 1968 45, 231-235. 

The product of Ka and Kh must always equal the ion-product constant of water, lCT14. If the value of Ka is large, the value of Kb must be small that is, the stronger an acid, the weaker its conjugate base. Similarly, a small value of Ka (weak acid) implies a large value of Kb (strong base). 

Using Numbers The ion product constant of water rises with temperature. What is the pH of pure water at 313 K if at that temperature is 2.917 X 10 24 ... 

We read this question as, What are the concentration of hydronium ions and the concentration of hydroxide ions of a solution with a pH of 2 A pH of 2 corresponds to a [H30+] of 1.0 x 10 2. You can find the concentration of hydroxide ions in a number of ways. One way is to make use of the ion-product constant of water, kw, with the following equation ... 

Ion-product constant of water. Definition of pH of a solution. Definition of pOH of a solution. Another form of Equation (15.2). 

When these concentrations are multiplied, we obtain the expression and value called the ion product constant of water, K,. The concentration nnits are omitted in the value. 

Fisher JB (1987) Distribution and occurrence of aliphatic acid anions in deep subsurface waters. Geochim Cosmochim Acta 51 2459-2468 Fisher JR, Barnes HL (1972) The ion-product constant of water to 350°. J Phys Chem 76 90-99... 

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