- Water And Ph Chemistry Worksheet (Page 2 of 4) in pdf

- Water And Ph Chemistry Worksheet Page 2

What makes this molecule important?

Strong nucleophile…

Specific Heat …

High specific heat…

High heat of vaporization…

Water is nucleophilic

Water participates in many chemical reactions

–it is electron rich

–it is a weak nucleophile

–it is present in high concentration

Acid & Base and pH pH - pouvoir hydrogene

(the power of hydrogen)

Water undergoes ionization

Water ionizes to form the hydronium (hydroxyl) ion and hydroxide ions

Water can act as both an acid and base

The equilibrium constant for the ionization of water is:

The concentration of pure water

§

1 liter = 1000g MW of water is 10.015

-9

§

the final concentration of water is 55M and H+ concentration is about 1.8 x 10

§

Very little water actually dissociates

§

So Keq is very small – not easily measured or easy to use

Instead a different constant is used where the denominator is ignored

-14

= 1.0 X 10

pH is a measure of the proton concentration of a solution

when [H

] = [OH

] the solution is

when [H

] > [OH

] the solution is

Note t he r elationship! A c hange i n 1 p H u nits i s a t en f old

when [H

] < [OH

] the solution is

change i n h ydrogen i on c oncentration

- Water And Ph Chemistry Worksheet Page 2