strong

weak

concentrated

diluted

the point during titration when the

reaction is nearly complete

a chemical substance that changes colour at the endpoint

Methyl orange

Methyl red

Phenolphthalein

gains electrons and is oxidised.

loses electrons and is oxidised.

gains electrons and is reduced.

loses electrons and is reduced.

2MnO₄^- + 8H⁺ + 5e →  2Mn²⁺ 4H₂O

MnO₄^- + 8H⁺ + 5e →  Mn²⁺ 4H₂O

MnO₄^- + 8H⁺ + 8e →  Mn²⁺ 4H₂O

MnO₄^- + 5H⁺ + 5e →  Mn²⁺ 4H₂O

-5

+7

+5

-7

purple

colourless

light rose colour

pale yellow

to produce carbon dioxide and oxygen

to produce oxygen and water

to produce carbon

dioxide and water

none of these

Methyl red

No indicator

Methyl orange

Potassium permanganate

2/5

1/5

5

1/2