Acids and Bases Have

Two Different Faces

Acids and Bases

http://www.youtube.com/watch?v=zTLiJE-j1-I

http://studyjams.scholastic.com/studyjams/jams/science/matter/acids-and-bases.htm

Acids and Bases Every liquid you see has either acidic

or basic traits

Scientists use something called a pH scale to measure how acidic or basic a liquid is

The pH scale ranges from 0 to 14

Acids and Bases Litmus paper is used to tell us if a

liquid is an acid or base

Both acids and bases are potentially harmful

They eat away at other substances, especially the stronger they are

Acids and bases react with each other

More about Acids

How can I tell what liquids are acidic?

An acid is substance that has a pH less than 7 (0-6.9 on the pH scale)

Acids are sour

React with metals

Testing for an Acid: Turns blue litmus paper

red Red litmus paper stays red

More about Bases

How can I tell what liquids are basic?

A base is substance that has a pH greater than 7 (7.1-14 on the pH scale)

Bases taste bitter

Feel slippery on the skin

Testing for a Base: Turns red litmus paper

blue Blue litmus paper stays

blue

Acids and Bases

What about Neutral liquids?

Most liquids we find everyday have a pH near 7

Testing with litmus paper:Blue paper stays blueRed paper stays red

Acid or Base?

Acid or Base?

Acid or Base?