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An electrochemical cell is set up as shown in the diagram - HSC - SSCE Chemistry - Question 5 - 2005 - Paper 1
Question 5
An electrochemical cell is set up as shown in the diagram. What are two observations for this electrochemical cell? (A) A reading was shown on the voltmeter (B) In... show full transcript
Worked Solution & Example Answer:An electrochemical cell is set up as shown in the diagram - HSC - SSCE Chemistry - Question 5 - 2005 - Paper 1
Step 1
Observation 1: In Beaker 2 the blue solution faded
Answer
In an electrochemical cell, a typical observation involves changes in the color of the solutions. As the reaction proceeds, the copper(II) ions in Beaker 2 may reduce, leading to a decrease in the blue color, which indicates the depletion of Cu²⁺ ions.
Step 2
Observation 2: A reddish precipitate formed on the copper electrode
Answer
The copper ions in the solution can deposit onto the copper electrode in the form of a reddish precipitate as the electrochemical reaction occurs. This observation is common when copper is reduced from its ionic form.