acids, bases and ph. our goals for today to determine the difference between acids & bases...
TRANSCRIPT
Our Goals for today
• To determine the difference between Acids & Bases
• Discuss the importance of studying Acids & Bases
• Perform an experiment dealing with Acids & Bases
Characteristics Of Acids
Acids can be characterized by:
1. A sour taste
2. Acids turn litmus paper red
3. Are corrosive
Characteristics of Bases
A Base is characterized by:
1. A bitter taste
2. It feels slippery
3. It turns litmus paper blue
Note: You should know the old school name for “basic” - alkaline
What is the pH scale?
• The pH scale measures how acidic or basic a solution is
1 2 3 4 5 6 7 8 9 10 11 12 13 14
← Acidic Neutral Basic →
Did we Miss something??
• What happens when the pH of a substance is exactly 7?
• Ans: A pH level of 7 indicates a Neutral Substance– Example: Distilled water
Identifying Acids and Bases
• Acids– Lower pH value indicates a
stronger acid.
• Bases– Higher pH value indicates a
stronger base.
Test Your Knowledge
• What is the range of an ACID on the pH scale?
Ans: 0-7
• What is the range of a BASE and what is another name for a BASE?
Ans: 7-14, Alkaline
Why Learn about Acids & Bases?
• What do you think is the pH level of De Soto tap water?
• Is it important for Lakes & Rivers to maintain a certain pH?
pH and your body
• Blood pH must be between 7.35 and 7.45
• A change of 0.1 lands you in intensive care
• A change of 0.2 is lethal
Your body has buffers!
• Blood has chemicals which act like playpen walls keeping your blood pH where it should be
• It adds chemicals to get the pH back to neutral– Combine acids and
bases – get WATER
Owwww!
• When your blood can’t get the acids built up in the muscles when you exercise moved away fast enough…
• YOU CRAMP!!!
• So what should you drink to fix the excess of acid???