Wednesday, April 29, 2015 Unit 13: Acids and Bases! 13.2 pH

Binder HW for checking: U12 Flash Cards 13.1 CW 13.1 HW (collect)

Notes: DO NOW

(Seat)

Chemistry Reference Table

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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

than pH 11?

_________________________________________

Homework

• 13.2 HW