15. Estimation of copper in copper(II) salts
- 00:24 Why is it important to have a precise digital balance?
- 00:46 Why is it important to rinse and keep the rinse-water?
- 01:04 Why is it important to swirl thoroughly?
- 01:05 What reaction occurs between the KI and the copper(II) sulfate?
- 01:09 With what is the starch reacting?
- 01:29 When the starch loses its blue-black colour, what does this tell you?
digital balance (pref. 3-decimal places but minimum 2-dp)
2 x 50 cm3 beakers
250 cm3 beaker
3 x 250 cm3 conical flask
250 cm3 volumetric flask with stopper
25 cm3 volumetric pipette and filler
burette, funnel, stand
wash-bottle of de-ionised water
2 x Pasteur pipette
CuSO4.5H2O crystals – moderate health hazard, corrosive, hazardous to the aquatic environment
Contact with eyes and skin
Eye: flood with water (10 min). See doctor.
KI powder – irritant
Contact with eyes and skin.
Eye: flood with water (10min). See doctor.
Skin: wash with plenty of water.