SSCE VCE Chemistry Redox Reactions: A galvanic cell is constructed f

A galvanic cell is constructed from the following two half cells under standard conditions - VCE - SSCE Chemistry - Question 7 - 2008 - Paper 1

Question 7

A galvanic cell is constructed from the following two half cells under standard conditions. Half cell 1: a nickel electrode in a solution of 1.0 M nickel nitrate Hal... show full transcript

Worked Solution & Example Answer:A galvanic cell is constructed from the following two half cells under standard conditions - VCE - SSCE Chemistry - Question 7 - 2008 - Paper 1

Step 1

Given that the standard reduction potential of Cd^{2+}(aq) / Cd(s) is -0.40V, show on the above sketch the direction in which electrons will flow in the external circuit of this galvanic cell.

96%

114 rated

Answer

In a galvanic cell, electrons flow from the anode to the cathode. In this case, since Cd(s) has a higher standard reduction potential than Ni(s), the nickel half-cell will serve as the anode where oxidation occurs. Therefore, electrons will flow from the nickel electrode (Ni) to the cadmium electrode (Cd) in the external circuit.

Step 2

Give the equation for the half reaction that takes place at the anode of this cell.

99%

104 rated

Answer

The half-reaction that takes place at the anode of this cell can be represented as:

$Ni^{2+}(aq) + 2e^{-} \rightarrow Ni(s)$

This shows that nickel ions in solution gain electrons at the anode to form nickel metal.

Step 3

List two factors that need to be considered when selecting an appropriate substance for use in the salt bridge.

96%

101 rated

Answer

The substance must be soluble in water to ensure effective ionic migration.
It should not react with the components in the half-cells, ensuring no precipitate forms that could impede ion flow.

A galvanic cell is constructed from the following two half cells under standard conditions - VCE - SSCE Chemistry - Question 7 - 2008 - Paper 1

Worked Solution & Example Answer:A galvanic cell is constructed from the following two half cells under standard conditions - VCE - SSCE Chemistry - Question 7 - 2008 - Paper 1

Given that the standard reduction potential of Cd^{2+}(aq) / Cd(s) is -0.40V, show on the above sketch the direction in which electrons will flow in the external circuit of this galvanic cell.

Give the equation for the half reaction that takes place at the anode of this cell.

List two factors that need to be considered when selecting an appropriate substance for use in the salt bridge.

Join the SSCE students using SimpleStudy...