core practical 10: investigating some electrochemical cells Flashcards
(4 cards)
1
Q
method
A
- use sandpaper to clean the strips of metal
- place copper strip in beaker containing 100cm^3 of 1M CuSO4 (aq)
- place zinc trip in beaker containing 100 cm^3 of 1M ZnSO4(aq)
- strip of filter paper soaked in potassium nitrate to act as salt bridge place one end in each beaker
- use crocodile clips and wires to connect the strips of metal together with a high resistance voltemeter
- recird the electrode potentials
1
Q
A
2
Q
purpose of salt bridge
A
free moving ions conduct charge
3
Q
what does the salt in the salt bridge need to be
A
unreactive with the electrodes and their solutions
