Question

Use the information given below to answer the questions about this standard electrochemical cell.

ξo(V)

Cu2+(aq) + 2 e- → Cu (s) + 0.34

Zn2+(aq) + 2 e-→ Zn (s) - 0.76

Mark each of these statements as True or False.

a.) The concentration of Cu2+ decreases as the reaction proceeds.

b.) The solid metal cathode decreases in mass.

c.) Negatively charged ions flow from the salt bridge to the anode.

d.) The electrons will flow from the anode to the cathode.

e.) Cu2+ is a product of this overall reaction.

Answer 1

The one with greater Eo value is cathode

So, cathode is Cu2+/Cu electrode

At cathode reduction occurs

So, the overall reaction is:

Cu2+(aq) + Zn(s) —> Cu(s) + Zn2+(aq)

a)

This is True

Cu2+ is reactant and hence its concentration would decrease

b)

False

At Cathode, more Cu is being formed.

So, mass will increase

c)

True

Electrons are absorbed at Cathode and are released at anode.

So, electrons flow from Anode to Cathode.

Negative ions should flow to Anode to maintain charge.

d)

True

Electrons are absorbed at Cathode and are released at anode.

So, electrons flow from Anode to Cathode.

e)

False

Cu2+ is reactant