6.1 Properties of Acids and Alkali

What are the examples of acid ?

• Sodium hydroxide solution

• Soap water

• Hydrochloric acid

• Vinegar

What are the examples of alkaline solution?

• Hydrochloric acid

• Sodium hydroxide solution

• Vinegar

• Soap water

What is the pH range of alkalis?

• pH 1 - 6

• pH 7

• pH 8 - 14

Acid

• turns blue litmus paper red

• turns red litmus paper blue

Acids

• pH value less than 7

• Tastes bitter

• Corrosive

• Reacts with metals to produce hydrogen gas

Alkali

• pH value more than 7

• Tastes bitter

• Corrosive

• Tastes sour

Uses of acids and alkalis in daily life are

• agricultural

• industrial

• medical

• electrical

Dilute hydrochloric acid is a...

• Strong acid

• Weak acid

• Weak alkali

• Strong alkali

Which of the following are the indicators used to determine acidic and alkaline substances?

• Blue litmus paper and red litmus paper

• Universal indicator

• Methyl orange

• Phenolphthalein

Which of the following are the examples of alkaline substances?

• Tartaric acid

• Detergent

• Magnesium hydroxide

• Sulphuric acid