Chapter 12 - Acids, Bases, pH, Indicators

Question 1

Arrhenius theory of a base

Answer 1

A base is a substance which dissociates in aqueous solution to produce OH- ions

Question 2

Brønsted Lowry definition of an acid

Answer 2

Proton donor

Question 3

Brønsted Lowry definition of a base

Answer 3

A proton acceptor

Question 4

Conjugate pair

Answer 4

Two substances (acid and base) which differ by only one proton

Question 5

Conjugate acid

Answer 5

That which is formed after a base has accepted a proton

Question 6

Conjugate base

Answer 6

That which is formed when an acid donates a proton

Question 7

Alkali

Answer 7

A base that is soluble in water and contains Oh- ions

Question 8

Salt

Answer 8

A compound formed when the hydrogen of an acid is replaced by a metal or ammonium ion

Question 9

Amphoteric

Answer 9

A substance which can act as an acid and a base eg H2O

Question 10

Strong Acid or Base

Answer 10

One which readily donates/accepts protons and is 100% ionised in aqueous solution

Question 11

Weak acid/base

Answer 11

One which does not readily donate/accept protons and is not 100% ionised in aqueous solution

Question 12

Neutralisation

Answer 12

The reaction between an acid and a base to form a salt and water

Question 13

pH

Answer 13

-log to the base 10 of the [H+] concentration

Question 14

Indicators

Answer 14

Substances which change colour according to the pH of the solution they are placed in

Question 15

Self ionisation of water

Answer 15

Pure water will conduct a tiny electric current due to the fact that water dissociates slightly to form ions

Question 16

Ionic product of water Kw

Answer 16

The product of the H+ and OH- ion concentrations in all aqueous solutions

Question 17

Arrhenius theory of an acid

Answer 17

An acid is a substance which dissociates in aqueous solution to produce H+ ions