Science behind corrosion-test
Corrosion is defined as an activity that transforms refined metals into more chemically stable forms such as oxide, hydroxide, carbonate, or sulfide. It refers to the slow decomposition of things (typically metals); thanks to chemical and/or electrochemical reactions with their surroundings. Corrosion engineering is the science of preventing and controlling corrosion.
Corrosion
Corrosion is defined as an activity that transforms refined metals into more chemically stable forms such as oxide, hydroxide, carbonate, or sulfide. It refers to the slow decomposition of things (typically metals); thanks to chemical and/or electrochemical reactions with their surroundings. Corrosion engineering is the science of preventing and controlling corrosion.
![**3. Complete and balance the following redox equation:**
\[ \text{H}_2\text{S} + \text{HNO}_3 \rightarrow \text{S} + \text{NO} \]
*(acidic solution)*
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To balance this redox equation, follow these steps:
1. **Identify the Oxidation and Reduction Half-Reactions:**
- **Oxidation**: \( \text{H}_2\text{S} \rightarrow \text{S} \)
- **Reduction**: \( \text{HNO}_3 \rightarrow \text{NO} \)
2. **Balance Each Half-Reaction Separately:**
- **Oxidation**:
\[ \text{H}_2\text{S} \rightarrow \text{S} + 2\text{H}^+ + 2e^- \]
- **Reduction**:
\[ \text{HNO}_3 + 3e^- + 3\text{H}^+ \rightarrow \text{NO} + 2\text{H}_2\text{O} \]
3. **Equalize Electrons Transferred:**
- Multiply the oxidation half-reaction by 3 and the reduction half-reaction by 2 to equalize the electrons.
4. **Combine and Simplify:**
\[ 3(\text{H}_2\text{S}) + 2(\text{HNO}_3) + 6(\text{H}^+) + 6e^- \rightarrow 3(\text{S}) + 2(\text{NO}) + 4(\text{H}_2\text{O}) + 6(\text{H}^+) + 6e^- \]
5. **Final Balanced Equation:**
\[ 3\text{H}_2\text{S} + 2\text{HNO}_3 \rightarrow 3\text{S} + 2\text{NO} + 4\text{H}_2\text{O} \]
- **Note**: Make sure to double-check balance of mass and charge. The coefficients ensure that the number of atoms for each element and the charge are the same on both sides of the equation.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fe413ba53-b36f-40cd-9f3b-7507865f79d2%2F295ec751-28cc-4d02-96bb-b6699b2d4956%2Fd3wqnwf_processed.jpeg&w=3840&q=75)
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