Planning

Question 1

What indicator can be used for strong acid-strong base?

Answer 1

All indicators can be used
(just use methyl orange for more distinctive colour change)

Question 2

What indicators can be used for weak acid-strong base titration?

Answer 2

thymolphthalein, thymol blue

Question 3

What indicators can be used for strong acid-weak base titration?

Answer 3

methyl orange, screened methyl orange

Question 4

What is the colour of V²⁺?

Answer 4

Violet

Question 5

What is the colour of V³⁺?

Answer 5

green

Question 6

What is the colour VO²⁺?

Answer 6

blue

Question 7

What is the colour of VO₂⁺?

Answer 7

yellow

Question 8

What is the colour of VO₃⁻?

Answer 8

yellow

Question 9

What is the colour of VO₄³⁻?

Answer 9

colourless

Question 10

What is the colour of Mn²⁺?

Answer 10

Pale pink

Question 11

What is the colour of MnO₂?

Answer 11

dark brown ppt.

Question 12

What is the colour of MnO₄²⁻?

Answer 12

dark green

Question 13

What is the colour of MnO₄⁻?

Answer 13

Purple

Question 14

What is the colour change of methyl orange?

Answer 14

• red (if pH < pH range)
• orange
• yellow (if pH > pH range)

Question 15

What is the colour change of screened methyl orange?

Answer 15

• violet (pH < pH range)
• grey
• green (pH > pH range)

Question 16

What is the colour change of phenolphthalein?

Answer 16

• colourless (pH < pH range)
• pink (pH > pH range)

Question 17

What is the colour change of thymolphthalein?

Answer 17

• colourless (pH < pH range)
• blue (pH > pH range)

Question 18

What is colour change of thymol blue?

Answer 18

• yellow (pH < pH range)
• blue (pH > pH range)