3-2 Describing Acids And Bases

Describing Acids and Bases Chapter 3, Section 2

Properties of Acids  Acids are compounds that share some

physical and chemical properties  An acid is a substance that tastes sour, reacts with metals and carbonates, and turns blue litmus paper red

Properties of Acids Sour Taste

Reactions with Metals

 Lemons

 Acids react with certain

 Citrus  Spoiled Milk

metals to produce H2  When they react, metals seem to disappear in the solution  Corrosive- eat away at other materials

Reactions with Reactions with Carbonates Indicators  Acids react with  Indicator- a compound carbonate ions in a that changes color characteristic way when in contact with an acid or a base.  Carbonate ions contain carbon and oxygen atoms bonded together (CO32- )  Acids react with CO32-

to form a gas- CO2

Properties of Bases  Bases are a group of compounds that

can be identified by their physical and chemical properties  A base tastes bitter, feels slippery, and turns red litmus paper blue  “Opposite” of acids

Bitter Taste

Slippery Feel

 Tonic water

 Soap

 Soaps

 Strong bases can

 Shampoos

irritate or burn the skin

 Detergents

Reactions with Indicators  Red litmus paper turns blue  Bases=blue

Reactions of Bases  Doesn’t react with

carobonates