What indicator can be used for strong acid-strong base?
All indicators can be used
(just use methyl orange for more distinctive colour change)
What indicators can be used for weak acid-strong base titration?
thymolphthalein, thymol blue
What indicators can be used for strong acid-weak base titration?
methyl orange, screened methyl orange
What is the colour of V²⁺?
Violet
What is the colour of V³⁺?
green
What is the colour VO²⁺?
blue
What is the colour of VO₂⁺?
yellow
What is the colour of VO₃⁻?
yellow
What is the colour of VO₄³⁻?
colourless
What is the colour of Mn²⁺?
Pale pink
What is the colour of MnO₂?
dark brown ppt.
What is the colour of MnO₄²⁻?
dark green
What is the colour of MnO₄⁻?
Purple
What is the colour change of methyl orange?
- red (if pH < pH range)
- orange
- yellow (if pH > pH range)
What is the colour change of screened methyl orange?
- violet (pH < pH range)
- grey
- green (pH > pH range)
What is the colour change of phenolphthalein?
- colourless (pH < pH range)
- pink (pH > pH range)
What is the colour change of thymolphthalein?
- colourless (pH < pH range)
- blue (pH > pH range)
What is colour change of thymol blue?
- yellow (pH < pH range)
- blue (pH > pH range)
