Discussion Overview
The discussion revolves around the use of Pourbaix diagrams to analyze the corrosion behavior of copper in water at a specific pH level (pH = 8). Participants explore the relationship between electrochemical potential and the stability of copper, as well as the practical aspects of measuring potential in experimental setups.
Discussion Character
- Exploratory
- Technical explanation
- Debate/contested
- Mathematical reasoning
Main Points Raised
- One participant inquires about the appropriate electrochemical potential to use for determining the stability of copper at pH = 8 and whether to consider all values of E between certain lines on the Pourbaix diagram.
- Another participant explains that the Pourbaix diagram indicates the stability of different forms of a metal over various potentials and pH levels, and mentions that potential can be measured using a potentiometer or applied voltage.
- A participant suggests connecting copper to a standard hydrogen electrode (SHE) to measure the voltage, noting that without a specified E value, a unique answer cannot be provided.
- There is a query about the factors that contribute to metal corrosion, with a suggestion that oxygen might be a key element.
- Another participant questions whether copper would corrode in a water solution devoid of oxygen, indicating uncertainty about the implications of oxygen's presence on corrosion rates.
- One participant states that oxidation occurs above 0.1V, while copper remains stable below this potential.
- A later reply emphasizes that the discussion is not an assignment but rather an exploration of the topic, clarifying the process of using the Pourbaix diagram to determine stability based on pH and potential.
Areas of Agreement / Disagreement
Participants express differing views on the role of oxygen in corrosion and the conditions under which copper remains stable. There is no consensus on the implications of oxygen's absence for corrosion rates, and the discussion remains unresolved regarding the specific potential range for corrosion at pH = 8.
Contextual Notes
Participants acknowledge the need for clarity in the question regarding the potential range for copper corrosion, and there are references to the limitations of the Pourbaix diagram in capturing all relevant factors affecting corrosion.