Chemistry

06. Double titration

  • 00:22 Why not add both indicators at the start?
  • 00:22 Why use phenolphthalein first?
  • 00:33 Why is it important not to agitate the flask more than necessary?
  • 00:47 Why is a white tile useful?
  • 50 cm³ burette and funnel   

  • burette clamp and stand 

  • 5 cm³ bulb / volumetric pipette with safety filler

  • 2 x 250 cm³ conical flask

  • white tile

Hazard Risk Control measure

0.1mol dm-3 HCl solution

Contact with eyes

Flood eye with tap water

NaOH/Na2CO3 Mixed solution

Contact with eyes & skin

Eye: Flood with tap water

Skin: Drench with water

Phenolphthalein indicator

Flammable, acute toxicity, serious health hazard, corrosive, hazardous to aquatic environment

Avoid naked flames

Methyl orange indicator

Acute toxicity, serious health hazard, corrosive, hazardous to aquatic environment.

Avoid naked flames