Ch 18 Hydrogen Ions And PH

Question 1

Ion product constant for water

Answer 1

The value of the equilibrium constant expression for the self ionization of water

Question 2

Ion product constant of water equation

Answer 2

Kw = [H+] [OH-]

Kw= The ion product constant for water

 [H+] = Concentration of the hydrogen ion

 [OH-] = Concentration of the hydroxide ion

Question 3

The product of [H+] and [OH-] …

Answer 3

Always = 1.0 x 10^-14

Question 4

Give an analogy for how hydrogen ions and hydroxide ions balance

Answer 4

Went on a seesaw if one side is heavier it goes down while the other goes. But sometimes the seesaw can be balanced and in the middle. If a H+ ions increases then the concentration of OH- ions must decrease

Question 5

What is pH?

Answer 5

Chemist express the concentration of hydrogen ions using a pH scale based on common Logarithms.

The pH of a solution is the negative logarithm of the hydrogen ion concentration

Question 6

PH equation

Answer 6

pH= - log [H+]

[H+] = The hydrogen ion concentration

Question 7

True or false
At 298K aesthetic solutions have pH values below seven. Meanwhile basic solutions have pH values above seven

Answer 7

True

Question 8

What is pOH ?

Answer 8

The negative logarithm of the hydroxide ion concentration

pOH= - log [OH-]

Question 9

True or false
at 298K a solution with POH less than 7.00 is basic. a solution with POH of 7.00 is neutral. And a solution with a POH greater than 7.00 is acidic

Answer 9

True

Question 10

How pH and pOH are related

Answer 10

pH + pOH= 14.00