Transcript Learning Check pH4

Learning Check pH4
A. The [H3O+] of tomato juice is 1 x 10-4 M.
What is the pH of the solution?
1) - 4
2)
4
3)
8
B. The [OH-] of an ammonia solution is
1 x 10-3 M. What is the pH of the solution?
1)
3
2)
11
3)
-11
Solution pH4
A. pH = - log [ 1 x 10-4] = -(- 4) = 4
B. [H3O+] = 1 x 10-11
pH = - log [ 1 x 10- 11] = -(- 11) = 11
Learning Check pH5
The pH of a soap is 10. What is the
[H3O+] of the soap solution?
1) 1 x 10 - 4 M
2) 1 x 1010 M
3) 1 x 10 - 10 M
Solution pH5
The pH of a soap is 10. What is the
[H3O+] of the soap solution?
[H3O+]
= 1 x 10-pH M
= 1 x 10-10 M
pH on the Calculator
[H3O+] is 4.5 x 10-6 M
pH = 4.5 x EXP(or EE) 6+/- LOG +/= 5.35
Learning Check pH6
A soap solution has a [H3O+] = 2 x 10-8 M.
What is the pH of the solution?
1) 8
2) 7.7
3) 6
Solution pH6
A soap solution has a [H3O+] = 2.0 x
10-8 M. What is the pH of the solution?
B) 2.0
EE
8
+/-
LOG +/- = 7.7
Learning Check pH7
Identify each solution as
1. acidic
2. basic
3. neutral
A. _____
HCl with a pH = 1.5
B. _____
Pancreatic fluid [H+] = 1 x 10-8 M
C. _____
Sprite soft drink pH = 3.0
D. _____
pH = 7.0
E. _____
[OH- ] = 3 x 10-10 M
F. _____
[H+ ] = 5 x 10-12
Solution pH7
Identify each solution as
1. acidic
2. basic
3. neutral
A. _1__
HCl with a pH = 1.5
B. _2__
Pancreatic fluid [H+] = 1 x 10-8 M
C. _1__
Sprite soft drink pH = 3.0
D. _3__
pH = 7.0
E. _1__
[OH-] = 3 x 10-10 M
F. _2__
[H+] = 5 x 10-12
Acid Rain
 Unpolluted rain has a pH of 5.6
 Rain with a pH below 5.6 is “acid rain“
 CO2 in the air forms carbonic acid
CO2 + H2O
H2CO3
 Adds to H+ of rain
H2CO3
Formation of acid rain:
H+ (aq) + HCO3-(aq)
Sources of Acid Rain
Power stations
Oil refineries
Coal with high S content
Car and truck emissions
Bacterial decomposition, and lighting
hitting N2
SO2
NO and NO2
26 million tons in 1980
22 million tons in 1980
Mt. St Helens (1980)
400,000 tons SO2
 Reactions with oxygen in air form SO3
2SO2 + O2
2 SO3
 Reactions with water in air form acids
SO3 + H2O
H2SO4 sulfuric acid
NO + H2O
HNO2 nitrous acid
HNO2 + H2O
HNO3 nitric acid
Effects of Acid Rain
 Leaches Al from soil, which kills fish
 Fish kills in spring from runoff due to
accumulation of large amounts of acid in
snow
 Dissolves waxy coatings that protect leaves
from bacteria
 Corrodes metals, textiles, paper and leather