Question

can some1 explain the relation between
pH
Kw
pKw
H2O +H20 = [H3O] [OH]

Answer 1

probably some others i forgot to put in there but thats the stuff i am confused about

Answer 2

Definition of pH, pOH, pKw, pKa, pKb

The p" factor" is defined as the log of the whatever quantity that follows the symbol. The "p" is an operator. It communicates the instruction to calculate the negative log of any quantity that follows the symbol. The definition of pH in equation form is


pH = -log[H1+] where [H1+] means the molar concentration of hydronium ions, M = moles / liter

This allows the definition of the following series of quantities.
pOH = -log[OH-]

the negative log of the hydroxide ion molarity

pKw = -log Kw

the negative log of the water ion product , Kw

pKa = -log Ka

the negative log of the acid dissociation constant, Ka

pKb = -log Kb

the negative log of the base dissociation constant, Kb

The relationship pH + pOH = 14

In a water solution the ion product for water is:

[H+] [OH-] = Kw = 1 X 10-14
Take the -log of both sides of the equation

- log [H+] +(- log [OH- ]) = - log [1 X 10-14 ]

pH + pOH = 14

Calculations of pH

For strong acids like HCl the molar concentrations are essentially the hydronium ion concentration. These strong acids can produce solutions where the pH can be equal to or less than 1, the pH value would have a value from 0-14.

pH is the negative log of hydrogen ion concentration

Kw is ionic product of water
Water dissociates slightly to form ions

H2O <==========> H+ + OH-

The equilibrium constant Kw = [H+] [OH-]

[H2O] is left out from the equation as its concentration is virtually constant. (due to high concentration compared to the concentration of ions).

At 25 degree C, [H+] = [OH-] = 1.0 x 10^-7

Hence, Kw = 1.0 x 10^-14



pOH = -log[OH-]

the negative log of the hydroxide ion molarity

pKw = -log Kw

the negative log of the water ion product , Kw

pKa = -log Ka

the negative log of the acid dissociation constant, Ka

pKb = -log Kb

the negative log of the base dissociation constant, Kb

Answer 3

tyvm