Acids and Bases

When we think of the terms “acid” and “bases” we tend to think of chemistry lab acids and bases like: However, we come into contact everyday with these items, at home, at school, at the beach, etc.

Acids cause… Lemons to be sour

Acids cause… Loss of tooth enamel

Acids Taste sour When acids and metals react, a salt and hydrogen (H) gas is produced Has a pH value below 7 Are corrosive – destroy other materials

Turns blue litmus paper red Acids Turns blue litmus paper red

When added to water (H2O) lose a Proton and form hydrogen ions (H+) Acids When added to water (H2O) lose a Proton and form hydrogen ions (H+)

Bases Taste bitter Feel slippery Don’t react with metals Strong bases can burn skin

Turns red litmus paper blue. Bases Turns red litmus paper blue.

Bases Has a pH value above 7 When added to water (H2O) gain a Proton and form hydroxide ions (OH-)

pH Testing

strengths of acids & bases refers to how well an acid or base separates into ions in water

pH scale ranges from 0 – 14 pH < 7 acid pH = 7 neutral pH > 7 base pH Scale song

Universal indicator shows how acidic or alkaline a solution is

neutralization reaction between an acid & base produces water & a salt an ionic compound

Review ACID or BASE? tastes sour forms hydroxide ions in water pH= 8 reacts with metals to produce H gas feels slippery turns red litmus paper blue

ACID or BASE A reaction between an acid and a base is a __ reaction. The pH of a neutral solution is __. The products formed when a base reacts with an acid are __ and __. The symbol for a hydrogen ion is __ and the symbol for a hydroxide ion is___.