Scelta multipla
Given the following standard reduction potentials,
Hg22+(aq) + 2 e– 2 Hg (l) E° = +0.789 V
Hg2Cl2(s) + 2 e– 2 Hg (l) + 2 Cl-(aq) E° = +0.271 V
determine Ksp for Hg2Cl2(s) at 25 °C.
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20. Electrochemistry
Galvanic Cell
Scelta multipla
Which of the following correctly describes the products of the electrolysis of an aqueous solution of KI?
A
H2 (g) and O2 (g)
B
H2 (g) and I2 (l)
C
K (s) and O2 (g)
D
K (s) and I2 (l)
Guida verificata passo dopo passo1
Identify the components of the aqueous solution: KI dissociates into K⁺ and I⁻ ions in water.
Understand the process of electrolysis: In electrolysis, an electric current is passed through the solution, causing chemical reactions at the electrodes.
Determine the reactions at the cathode: At the cathode, reduction occurs. Water can be reduced to form H₂ gas, or K⁺ ions can be reduced to form K metal. However, in aqueous solutions, water is more likely to be reduced than K⁺ ions.
Determine the reactions at the anode: At the anode, oxidation occurs. I⁻ ions can be oxidized to form I₂, or water can be oxidized to form O₂ gas. I⁻ ions are more easily oxidized than water in this scenario.
Conclude the products: Based on the reactions at the electrodes, the products of the electrolysis of an aqueous KI solution are H₂ gas at the cathode and I₂ at the anode.
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