RP 8 measuring EMF of an electrochemical cell

Question 1

What is an electrochemical cell

Answer 1

2 diff half cells are connected by a salt bridge with electrodes connected by a voltmeter

Question 2

What is a saltbridge

Answer 2

Allows flow of ions and completes circuit
Concentrated solution of KNO3

Question 3

How do you measure comparative electrode potentials of different metals

Answer 3

File piece of copper and Connect piece of copper to positive voltmeter
Cut a piece of filter paper, saturate with KNO3 and place on top of copper
Connect voltmeter to another piece of metal
Hold metal against filter paper and record voltmeter value
Repeat with diff metals and record in table

Question 4

Why to file outer layer

Answer 4

Removes oxide layer on outside of the metal