Acids & Redox

Question 1

Give 3 well known acids

Answer 1

• HCl
• HNO3
• H2SO4

Question 2

Acids are referred to as “proton - what?

Answer 2

Proton donors

Question 3

An acid is classed as having a PH less than what?

Answer 3

7

Question 4

What do strong acids to in water?

Answer 4

Fully dissociate

Question 5

What do weak acids do in water?

Answer 5

Partially dissociate

Question 6

Which type of acid is better at giving up protons? ( i.e. a better proton donor)

Answer 6

Strong acids

Question 7

Bases are classed as “proton - whats’?

Answer 7

Proton acceptors

Question 8

How does a base neutralise an acid?

Answer 8

By accepting the H+ ions released by the acid

Question 9

Alkali’s have PH values of what?

Answer 9

Over 7.0

Question 10

What do Alkali’s release?

Answer 10

OH- ions

Question 11

What is the equation of an Alkali neutralising an Acid?

Answer 11

H+ + OH- —–> H2O

Question 12

Is Ammonia a weak or strong base?

Answer 12

Weak

Question 13

Why is Ammonia a weak base?

Answer 13

Only a small proportion of the ammonia reacts with the water

Question 14

What is a Standard solution?

Answer 14

A solution of an accurately known concentration

Question 15

Acid-base titrations are a form of what?

Answer 15

Volumetric analysis

Question 16

What is an Acid-base titration used for?

Answer 16

To find an unknown

Question 17

Give 2 indicators that can be used in Acid-based titrations

Answer 17

• Phenolphthalein

- Methyl Orange

Question 18

What 4 unknowns can acid-base titrations be used to find?

Answer 18

• Concentration
• Molar Mass
• Formula
• Water of Crystallisation

Question 19

What type of compound is a salt?

Answer 19

An IONIC compound

Question 20

What type of reaction are salts formed in?

Answer 20

Neutralisation reactions

Question 21

What four reactions can produce salts?

Answer 21

Acid + Base
Acid + Carbonate
Acid + Metal
Acid + Metal Oxide

Question 22

What is formed when an acid reacts with a carbonate?

Answer 22

SALT + water + CO2

Question 23

How are Ammonium salts produced?

Answer 23

When acids are neutralised with NH3

Question 24

What does Anhydrous mean?

Answer 24

Without water

Question 25

What does ' A Hydrated salt' mean?

Answer 25

Water is present in its' structure

Question 26

What does the dot formulae indicate?

Answer 26

The ratio of water in a crystal

Question 27

What is shown after the dot in 'Dot Formulae' ?

Answer 27

The relative number of water molecules

Question 28

What do oxidising agents do?

Answer 28

Oxidise other species, whilst reducing themselves

Question 29

What do reducing agents do?

Answer 29

Reduce other species, whilst oxidising themselves

Question 30

Outline the process of an acid-base titration

Answer 30

- Measure alkali into flask - Add indicator - Fill burette with known acid - Do rough titration - Do accurate titration - Conduct 2/3 times - Take an average