pH And Indicators

Question 1

What is pH?

2

Answer 1

-log(base 10) [H+]

Where the square brackets indicate concentration in moles per litre

Question 2

What is the pH of a solution?

Answer 2

The negative logarithm to the base 10 of the hydrogen ion concentration measured in moles per litre

Question 3

What is the pH of an acidic solution?

Answer 3

Less than 7

Question 4

What is the pH of the basic (alkaline) solution?

Answer 4

Greater than 7

Question 5

What is the pH of a neutral solution?

Answer 5

Equal to seven

Question 6

What is a strong acid?

Answer 6

A good proton donor

Question 7

What is a weak acid?

Answer 7

A poor proton donor

Question 8

What is the acid dissociation constant, Ka, defined as?

Answer 8

[H+][A-] divided by [HA]

Question 9

What is a strong base?

Answer 9

A good proton acceptor

Question 10

What is a weak base?

Answer 10

A poor proton acceptor

Question 11

What type of conjugate base does a strong acid have?

Answer 11

A weak conjugate acid

Question 12

What type of conjugate base does a weak acid have?

Answer 12

A strong conjugate base

Question 13

What does pH + pOH equal?

Answer 13

14

Question 14

What is pOH?

Answer 14

-log(base 10)[OH-]

Question 15

What does [H+] equal?

2

Answer 15

Square root of Ka x M acid

Where M acid is the concentration of the acid in moles per litre

Question 16

What does [OH-] equal?

2

Answer 16

The square root of Kb x M base

Where M base is the concentration of the base in moles per litre

Question 17

What is an acid base indicator?

Answer 17

An acid-base indicator is a substance that changes colour according to the pH of the solution in which it is placed

Question 18

What is the range of an indicator?

Answer 18

The range of an indicator is the pH interval over which there is a clear change of colour for that indicator