Acid And Alkali

Question 1

Define acid

Answer 1

Substance that dissociates in water to produce hydrogen ions
All acids contain H+ ion
All acids have H+ ions, but not all compounds that have hydrogen are acid!!

Question 2

Acid physical properties

Answer 2

Sour taste
Ph<7
Turns blue litmus paper red

Question 3

Unreactive metals

Answer 3

Gold silver copper

Question 4

Test for hydrogen gas

Answer 4

1. Effervescence observed
2. Colourless and odourless gas
3. Gas extinguishes lighted splint with a “pop” sound
4. Gas is hydrogen

Question 5

Test for carbon dioxide

Answer 5

Effervescence observed
Colourless and odourless gas
Gas forms white precipitate in limewater

Question 6

Limewater

Answer 6

Ca(OH)2
Calcium hydroxide

Question 7

Bases

Answer 7

Metal oxides and metal carbonates

Question 8

Alkali

Answer 8

Bases soluble in water
An aqueous solution that contains hydroxide ions
OH- ions

Question 9

Alkalis physical properties

Answer 9

Bitter taste soapy to touch
Turns red litmus paper blue
PH>7
Conducts electricity when dissolved in water

Question 10

Test for ammonia gas

Answer 10

Effervescence not observed as ammonia is very soluble in water
Colourless and pungent gas
Gas turns damp red litmus paper blue
Gas is ammonia gas