Chemistry

05. Back-titration

  • 00:24 Why is it important to grind the limestone chips to a powder?
  • 00:31 Why is it important not to round-off measurements?
  • 01:06 Why does heating the mixture help?
  • 01:17 Why allow the mixture to return to room temperature?
  • 01:24 Why is it important that the NaOH is standardised?

  • 3-decimal-place digital balance (min. 2-decimal place)

  • 25 cm³ pestle and mortar

  • 250 cm³ conical flask

  • hot-plate / hot water bath / bunsen burner

  • 50 cm³ burette, clamp and stand

  • funnel   

  • white tile

Hazard Risk Control measure

0.1mol dm-³ NaOH solution

Not hazardous

-

0.1mol dm-3 HCl solution

Not hazardous

-

Phenolphthalein indicator

Flammable - Contact with naked flame

Avoid naked flames