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Wednesday, April 29, 2015 Unit 13: Acids and Bases! 13.2 pH
1) How do the presence of acids and bases change the amount of H+ dissolved in the water.
Acids: _________________________________ Bases: ___________________________________ Blast from the past:
Strong acid
Strong base
pH scale
pH is a measure of the concentration of H+ ions or OH- ions in a solution. Concentration same as Molarity, so pH is also dependent on the molarity of a solution.
What is the meaning of neutral?
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14
ACIDD
BASE
NEUTRAL
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14
ACIDD
BASE
NEUTRAL
What does pH value mean
The more H+ or H3O+ ions there are (higher the
concentration of H+ or H3O+)
the more _______________________ it will be the
________________________the pH value
The more OH- ions there are (higher the concentration of
OH-)
the more _______________________it will be the
________________________ the pH value
Quick Practice
1) For each of the questions below, circle the option that will have the higher pH.
a. Solution with H+ concentrations of 0.43M or 0.57M
b. Solution with OH- concentrations of 2.4M or 1.9M c. Solution with H+ concentrations of 1.2M or 3.2M d. Solution with OH- concentrations of 4.3M or 4.4M
2) For each of the questions below, circle the option that will have the lower pH.
a. Solution with H+ concentrations of 0.19M or 0.23M
b. Solution with OH- concentrations of 5.6M or 5.25M
c. Solution with H+ concentrations of 9.9M or 8.6M
d. Solution with H+ concentration of 1.2M or 3.2M
*Each change of a single pH unit signifies a tenfold change in the concentration of the hydrogen ion or the hydroxide ion. The [H+] (concentration of H+ or H3O
+ ions) is ten times
greater in a solution with a pH of 5 as in a solution with a
pH of 6.
--How many times greater is the H+ concentration of pH 4
than pH 7?
________________________________________
The [OH-] (concentration of OH- ions) is 100 times greater
in a solution with a pH of 11 as in a solution with a pH of
9.
--How many times less is the OH- concentration of pH 8