Required Practicals Flashcards
Explain steps involved in measuring the EMF of an electrochemical cell (Cu/Zn)
Place copper strip into beaker with 50cm3 of 1 mol dm-3 CuSO4 solution
Place zinc strip into 50cm3 of 1mol dm-3 solution of ZnSO4
Use strip of filter paper soaked in saturated potassium nitrate solution for the salt bridge
Connect the half cells by connecting the metals using crocododile clips, a lead and a voltmeter
Describe the steps involved in recrystallisation of an organic solid
- Dissolve in minimum volume of hot solvent
- Filter through filter paper
- Cool filtered solution in ice beaker
- Filter under reduced pressure with Büchner funnel
- Wash crystals with distilled water
- Dry crystals with absorbent paper
Describe the steps involved in melting point testing
Thermometer with capillary tube containing samples strapped to it
Places in mineral oil
Heated
Temperature at which substance collapses
Melting point apparatus may also be used