8.4 pH Flashcards Preview

Chemistry Chapter 8 - Acids and Bases > 8.4 pH > Flashcards

Flashcards in 8.4 pH Deck (12):
1

What is the equation for pH?

-log10[H+(aq)]

2

What are the units for pH?

pH has no units.

3

What is the equation for finding the concentration of hydrogen ions?

[H+(aq)] = 10^(-pH)

4

What happens to the concentration of H+ ions when the pH increases by one unit?

A 10 fold decrease in the H+ concentration is required to increase the pH by one unit - every time a solution of strong acid is diluted by a factor of 10 the pH goes up by 1 unit.

5

How does water dissociate?

H2O (l) H+ (aq) + OH- (aq)

6

What is the equilibrium constant for the dislocation of water?

Kw = [H+(aq)][OH-(aq)]

7

Why is the concentration of water not included in the expression for Kw?

Because it is the solvent and its concentration is essentially constant.

8

What is Kw known as and what is its value?

The ionic products constant for water and has a value of 1.0x10^-14 at 25 degrees Celsius.

9

In any aqueous solution at 25 degrees celsius what is equal to 1.0x10^-14?

The product of H+ concentration and OH- concentration is 1.0x10^-14

10

When is the only time [H+] equals [OH-]?

In a neutral solution or in pure water.

11

What is the concentration of H+ ions compared to OH- in an acidic solution?

[H+] > [OH-]

12

What is the concentration of H+ ions compared to OH- in an alkaline solution?

[OH-] > [H+]