Learners performed an experiment to determine the electrode potential of an electrochemical cell under standard conditions - NSC Technical Sciences - Question 6 - 2023 - Paper 2
Question 6
Learners performed an experiment to determine the electrode potential of an electrochemical cell under standard conditions. They assembled the apparatus, as shown in... show full transcript
Worked Solution & Example Answer:Learners performed an experiment to determine the electrode potential of an electrochemical cell under standard conditions - NSC Technical Sciences - Question 6 - 2023 - Paper 2
Step 1
State the energy conversion taking place in this cell.
96%
114 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The energy conversion taking place in this cell is from chemical energy to electrical energy.
Step 2
Write down a balanced net ionic reaction of the cell.
99%
104 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The balanced net ionic reaction is:
ightarrow ext{Mg}^{2+} ext{(aq) + Zn (s)}$$
Step 3
In which direction will the SO₄²⁻ ions migrate through the salt bridge? Write down only FROM Zn TO Mg or FROM Mg TO Zn.
96%
101 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The SO₄²⁻ ions will migrate FROM Zn TO Mg.
Step 4
Is the cell reaction spontaneous or non-spontaneous?
98%
120 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The cell reaction is spontaneous.
Step 5
Calculate the emf of the cell.
97%
117 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
To calculate the emf of the cell, we can use the formula:
Ecell=Ecathode−Eanode
Given:
Sign up now to view full answer, or log in if you already have an account!
Answer
Component A is the salt bridge.
Step 7
Will the light bulb glow? Write YES or NO.
96%
114 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
NO
Step 8
Explain the answer to QUESTION 6.2.2.
99%
104 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The light bulb will not glow because the circuit is incomplete without component A (the salt bridge), which is necessary for the flow of ions and completion of the electrical circuit.
