Acids and Bases

Question 1

What is acid?

Answer 1

substance that produces H+ ions in aqueous solution

Question 2

Properties of acids.

Answer 2

1. Sour
2. dissolve in H2O to form solution which conduct electricity
3. turn blue litmus paper red

Question 3

Reaction of Acids with reactive metals to form…

Answer 3

salt & h2 gas

Question 4

Reaction of Acids with carbonate and hydrogen carbonates to form…

Answer 4

Salt, water & h2 gas

Question 5

Reaction of Acids with Metal oxides and hydroxides to form

Answer 5

salt and water only

Question 6

Role of water in acids

Answer 6

acids produce H2 gas ONLY in water

Question 7

Uses of acids

Answer 7

manufacture of fertilisers
manufacture of detergents
battery acid in cars

Question 8

What is a Base?

Answer 8

any metal oxide/hydroxide that react with an acid to produce salt and water only

Question 9

What is a alkali?

Answer 9

substance that produces OH-ions in aqueous solution

Question 10

Properties of Alkali

Answer 10

bitter
turn red litmus paper blue
react with acids to form salt & water only

Question 11

Alkalis when heated with ammonium salts, give off a gas. Name and show how to test

Answer 11

AMMONIA
pungent smell and can turn damp red litmus paper blue

Question 12

Alkalis react with a solution of one metal salt to give…

Answer 12

another metal salt and metal hydroxide.

Question 13

What is a strong acid?

Answer 13

completely ionises/dissociates in aqueous solution to form H+ ions

Question 14

What is a weak acid?

Answer 14

partially ionises/dissociates in aqueous solution to form H+ ions

Question 15

acids and alkali pH value

Answer 15

Acids is <7
Alkali is >7
neutral is 7

Question 16

How to measure pH of given solution?

Answer 16

chemical compound, Universal indicator
pH meter
pH sensor attached to data logger

Question 17

4 Types of Oxides

Answer 17

1. Acidic
2. Basic
3. Amphoteric
4. Neutral

Question 18

Acidic oxides dissolve in water to form….

Answer 18

acids

Question 19

Basic oxides react with acids to form….

Answer 19

salt and water

Question 20

Amphoteric oxides react with both acids and bases to form…

Answer 20

salts and water

Question 21

how does acid conduct electricity?

Answer 21

ions in aqueous acid solution are mobile, and can move freely & carry -ve electric charge during conduction

Question 22

some hazards on dilute acids

Answer 22

irritants, cause blister

Question 23

some hazards of concentrated acids

Answer 23

destroy outer skin, penetrate into flesh under skin

Question 24

acids turn what paper into what colour

Answer 24

blue to red

Question 25

acids react with carbonate to form what

Answer 25

salt water+ CO2

Question 26

other than ionisation in water, whats the difference between strong & weak acids?

Answer 26

strong: higher conc. of H+ ions
weak: lower conc. of H+ ions

Question 27

can strength of acid or conc of acid be changed?

Answer 27

only concentration can be changed

Question 28

how to find pH of solution with just concentration of H+ ions

Answer 28

pH = -log [H+]

Question 29

3 amphoteric oxides

Answer 29

zinc oxide, lead [II] oxide, aluminium oxide