1. Merlin’s Introduction to Acids And Bases

2. Standard Family and Consumer Science
SC7: The students will characterize the properties that describe solutions and the nature of acids and bases.

3. Essential Question
What makes you burp after drinking a Pepsi or a Coke? What makes your stomach feel better when you have heart burn? Can the basic knowledge of chemistry answer these essential questions?

4. What are acids and bases?
Think about how it taste when you eat war head candy or bite into a lemon. Was it so sour that your eyes began to squint and you held your mouth funny? Well that sour taste let you know that the candy and the lemon both are acids.
In Contrast
Have you ever had to wash your mouth out with soap or tasted very dark chocolate? Do you remember how bitter it was ? Things that are bitter are a base.

5. Common acids Citric acid- citrus fruits like oranges, limes, lemons.
Sulfuric acid- batteries, acid rain and volcanic smoke
Acetic acid- vinegar
Carbonic acid- soft drinks and rain water
Boric acid- eyewashes
Hydrochloric acid- gastric juice in the stomach

6. Acids contain hydrogen Acids react with metals to produce hydrogen.
Properties of acids
All acids have these characteristics……….
Acids taste sour
Acids contain hydrogen
Acids react with metals to produce hydrogen.

7. Two kinds of acid Acids you can eat Acids that are poisonous
Weak acids we often eat.
They give food that tangy sharp taste.
Certain fruits
Soft drinks
vinegar
Some acids will burn you
or cause breathing problems.
Gastric juice
Battery acid
Volcanic smoke
Acid rain

8. Common Bases Aluminum hydroxide- deodorants and water purification
Magnesium hydroxide- laxatives and antacids
Potassium hydroxide- soap and glass
Sodium hydroxide- drain cleaner and soap making
Calcium hydroxide-mortar

9. Bases contain the OH radical Bases feel slippery
Properties of Bases
All Bases have the following
Bases taste bitter
Bases contain the OH radical
Bases feel slippery

10. Testing for Acids and Bases
How can you test to see if something is an acid or a base?
You can taste and feel thing to see if they are an acid ( but that could be dangerous)
You can use indicators on substances to see if they are an acid or a base (best practice)
When you use Litmus paper as an indicator the paper will turn from blue to red if it is an acid and from red to blue if it is a base.

11. What is a PH?
Some indicators will give you a PH level…Have you ever checked the water in a pool or in an aquarium? Well you are checking the PH level.
Acids will have a PH level of 0-7
Bases will have a PH level of 7-14
Did you notice that in both acids and bases the number 7 appears? Substances that are neither an acid or a base are considered to be neutral. Guess what their PH level is?
(7)

12. Work Period Lets test our knowledge
We are going to conduct two labs today.
Lab 1: acid test for candy
Materials : cups
water
measuring cup
sour candy
spoon
baking soda
Lab 2: testing for bases and acids
Materials: cups
lemon juice
vinegar
dishwashing liquid
litmus paper

13. Closing What do all acids have in common?
What do all bases have in common?
Now think back to our essential question.
What is in that Pepsi or Coke that we drank that gave you that burn when you drank it, and what was it that made you feel the need to burp?
Why does the antacids ease that burning in your stomach after eating spicy foods?