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Questions and Answers
What is the primary basis of a redox titration?
What is the primary basis of a redox titration?
- Acid-base reaction
- Oxidation-reduction reaction (correct)
- Complexation reaction
- Precipitation reaction
According to modern definitions, what defines oxidative processes?
According to modern definitions, what defines oxidative processes?
- Loss of electrons (correct)
- Gain of hydrogen
- Combination with oxygen
- Gain of oxygen
In a redox reaction, what happens to the oxidation number during oxidation?
In a redox reaction, what happens to the oxidation number during oxidation?
- It fluctuates randomly
- It decreases
- It remains constant
- It increases (correct)
Which of the following processes is considered a reduction in terms of electron transfer?
Which of the following processes is considered a reduction in terms of electron transfer?
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What is the outcome of a reduction reaction based on the summary table?
What is the outcome of a reduction reaction based on the summary table?
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Study Notes
Redox Reactions
- REDOX is a type of titration using an oxidation-reduction reaction between the analyte and the titrant.
- Reduction is the process of gaining electrons, often involving the combination with hydrogen or the loss of oxygen.
- Oxidation is the process of losing electrons, often involving the combination with oxygen or the loss of hydrogen.
- Examples of reduction reactions include corrosion, combustion, and photosynthesis.
- Examples of oxidation reactions are similar to reduction reactions but with opposite outcomes.
- Formula examples of both reduction and oxidation reactions are provided.
- Reduction: $4 Fe(s) + 3O_2(aq) \rightarrow 2 Fe_2O_3(s)$
- Oxidation: $C_xH_y + nO_2 \rightarrow nCO_2 + n H_2O$
Defining Oxidation and Reduction
- Old definitions:
- Oxidation: Combination with oxygen or loss of hydrogen.
- Reduction: Combination with hydrogen or loss of oxygen.
- Modern definitions:
- Oxidation: A reaction that involves loss of electrons.
- Reduction: A reaction that involves gain of electrons.
Oxidation and Reduction Summary
- Feature | Reduction | Oxidation
- Loss of | O | O
- Gain of | $H$ | $H$
- Oxidation number | Decrease | Increase
- Electrons | Gain | Loss
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