electrochemical electrochemical Students are attempting to construct a battery i

Question

electrochemical

electrochemical

Students are attempting to construct a battery in the laboratory that will light up a light bulb. Compare the following lists prepared by students and determine which student will not be able to successfully build a "battery" that will light up the bulb.

Select one:

a. Student 1

large beaker

strip of aluminum metal

strip of silver metal

sodium nitrate solution

aluminum nitrate solution

a porous membrane

a length of copper wire

light bulb

b. Student 2

2 beakers

strip of magnesium metal

strip of nickel metal

magnesium chloride solution

nickel(II) chloride solution

potassium chloride salt bridge

a length of copper wire

light bulb

c. Student 3

2 beakers

strip of zinc metal

strip of gold metal

gold(III) chloride solution

zinc(II) chloride solution

sodium chloride salt bridge

a length of copper wire

light bulb

d. Student 4

1 large beaker

strip of cadmium metal

strip of copper metal

copper(II) chloride solution

cadmium chloride solution

sodium chloride solution

a porous membrane

a length of copper wire

light bulb

Comment

Explanation / Answer

Student 1 will not light up the bulb as he has taken sodium nitrate instead of silver nitrate. There is no Ag+ ion available for reduction. Ag has yo be reduced as its reduction potential is higher than Al.

Figure 1

b.

Br- is reducing agent and Cl2 is oxidizing agent. Br- reduces Cl2 to Cl- and Cl2 oxidizes Br- to Br2

Figure 2

e

Only in e all H are balanced

Figure 3

c

Reduction potential of gold is higher.

So gold is reduced and Li+ ion flows to gold solution to

make up the +ve charge reduced by gold

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