Acid & Base

Review

So as a compound, salt water is made up of sodium chloride (salt) and dihydrogen monoxide (water). Salt as an atom or element is made up of a bond of sodium and chlorine. Water (dihydrogen monoxide) is made up of hydrogen and monoxide.

Definition

All matter is either acidic, basic or neutral. We use pH to measure acidity and basicity

Acid

• Sour in taste

• pH < 7

• Corrosive

• Conducts electricity

• Converts blue litmus paper to red

  Examples: vinegar, lemon juice, battery acid, soda

Base

• Bitter in taste

• pH>7

• Corrosive

• Conducts electricity

• Converts red litmus to blue

  Examples: baking soda, ammonia, soap, borax

Indicators

Indicators are chemicals that show a change in colour when brought in contact with acids and bases

Litmus Test

• Blue litmus paper turns red in an acidic solution

• Red litmus paper turns blue in basic solutions

Universal Indicator

• Warm colors are acids, and the redder it is, the stronger it is.

• Cold colors are bases, and the purpler it is, the stronger of a base it is.

Natural Indicators:

• Bunga sepatu

• Bunga bougainville

• Kulot manggis

• Kubis ungu

• Kunyit

• Pacar air