ABB

Question 1

Equivalence point is

Answer 1

The point in a titration at which the volume of one solution has reacted exactly with the volume of the second solution
Matches the stoichiometry of the reaction

[H+]=[OH-]

Question 2

Strong acid and strong base

Answer 2

Vertical section

pH 3-11

Question 3

Strong acid and weak base

Answer 3

PH 3-7

Question 4

Weak acid and strong base

Answer 4

PH 7-11

Question 5

Weak acid and weak base

Answer 5

No vertical section

Question 6

Addition of acid

Answer 6

Increase in [H+]
Indicator equilibrium position will shift to the left to minimise the increase in [H+} by reacting H+ with A- to form more HA

Question 7

Addition of alkali

Answer 7

OH- + H+ —> H2O
Decrease in [H+]
Indicator equilibrium position will shift to the right to minimise the decrease in [H+]. More of the weak acid indicator will dissociate into H+ and A-

Question 8

The end point of an indicator

Answer 8

The PH at which there are equal concentrations of the weak acid and its conjugate base forms of the indicator
Colour of an indicator at its end point is mid way between the colours of the acid (HA) and conjugate base (A-) forms

Question 9

Choosing an indicator

Answer 9

The PH range/ end point of the indicator must coincide with the vertical section of the PH curve.