Daniel’s Cell
IB Chemistry In-Class Activity
1) If this is a standard cell, what is the concentration of the zinc sulphate solution? ________________
2) What is the pressure and temperature in this standard cell? __________________________________
3) Write down the 2 half equations for Zn2+ and Cu2+ from the data booklet. Include their voltages.
4) How do you know the zinc electrode is the negative electrode? ___________________________________
________________________________________________________________________________________
5) If it is negative, electrons are being produced here. Does your equation in 3) show this? If not reverse it and
replace the ↔ with a . NB: You never have to reverse the sign for the voltage.
6) How do you know the copper electrode is positive?
__________________________________________
________________________________________________________________________________________
7) As it is positive electrons are attracted here. Does your equation in 3) show this? If not reverse it and
replace the ↔ with a . If it does show the addition of electrons then the forward reaction is correct; replace
the ↔ with a .
8) Add the 2 half equations to get the equation for the cell.
9) Find the DIFFERENCE in the 2 voltages. This number must be positive in Chemistry. ___________V
10) Oxidised = _________
Oxidizing Agent: _________ Reduced:_______ Reducing Agent: ___________
11) Why does the zinc electrode get lighter? ____________________________________________________
________________________________________________________________________________________
12) Why does the concentration of the copper ions decrease? ______________________________________
13) What are the charge carriers in a) The wires _______________ b) the salt bridge __________________
14) Which direction do the potassium ions in the salt bridge move and why?
________________________________________________________________________________________
________________________________________________________________________________________
15) If 2 electrons go around the circuit:
a) How many zinc ions are produced? ______
b) How many copper atoms are produced? _______
16) 15) If 2 MOLES of electrons go around the circuit:
a) How many zinc ions are produced? _______
b) How many moles of copper atoms are produced? _____
17) Which electrode’s mass would change the most? Explain.
________________________________________________________________________________________
________________________________________________________________________________________
18) HL: Electrochemical cells can be written in the following shorthand notation:
Cu/Cu2+║Zn2+/Zn
Most+
most –
19 ) What does the ║ mean? ___________________