solutions of acids & bases chapter 14, section 3
TRANSCRIPT
SOLUTIONS OF ACIDS & BASES
Chapter 14, Section 3
Strengths of Acids & Bases
Depends on the number of molecules that break apart when they are dissolved in water
Acids
An acid is dropped into water… If all of the molecules break apart, then it is a _______ acid
If only a few break apart, then it is a ______ acid
strong
weak
Bases
A base is dropped into water… If all of the molecules break apart, then it is a ______ base
If only a few break apart, then it is a ______ base
strong
weak
Acids, Bases, Neutralization
Antacid + Stomach Neutralization Reaction
NR – an acid and base react to form water & salt (neutralize)
The pH scale
Is used to describe how acidic or basic a solution is.
pH of 7 is neutral (not acidic or basic) – water
Basic: pH 8-14 Acidic: pH 1-6
Tell me whether it is acidic or basic and guess what number: Detergents Milk Lemon Juice Clean Rain Acid Rain
Ammonia Sea water Human stomach Coke Saliva
0 1 2 3 4 5 6
7 8 9 10 11 12 13 14
Dete
rgen
ts
Milk
Coke
Lem
on Ju
ice
Am
mon
ia
Sea W
ate
r
Saliva
Human stomach
Cle
an
rain
Aci
d R
ain
Indicators
Use a pH indicator scale to determine the pH level
pH & the environment
Different plants prefer different pH levels
Pine trees – pH 4-6 Lettuce – pH 8-9
More nature junk
Hydrangea flowers – different colors call for different pH levels
high pHlow pH
Salts
Are produced when an acid neutralizes a base
Sodium hydroxide - Used to make baking soda
Sodium nitrate - used to preserve food
Calcium sulfate – used to make wallboard (construction)
http://www.neok12.com/php/watch.php?v=zX607e0205547b0a79040167&t=Acids-and-Bases