Podcast Beta
Questions and Answers
The reaction between Zn and NO3- produces Zn(OH)42- and ______.
NH3
To balance the charge in the reaction, electrons ______ are added.
e-
The first half-reaction involves Zn and ______.
OH-
In the second half-reaction, NO3- reacts with water and ______.
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To convert the reaction from acidic to basic, sufficient ______ is added.
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The balanced equation shows that ______ moles of zinc are needed.
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The final balanced equation includes 6 moles of ______ to balance the reaction.
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The combined reaction indicates the formation of ______ in the product side.
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The number of negative charges on the left side of the equation is represented as ______.
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The first step in balancing is writing 2 ______ equations for half reactions.
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Study Notes
Identifying Oxidation and Reduction Species
- The given reaction: Zn + NO3- → Zn(OH)42- + NH3 is a redox reaction occurring in basic aqueous conditions
Balancing Redox Reactions in Basic Solutions
- The process involves breaking the overall reaction into two half-reactions, one for oxidation and one for reduction.
- Balance all elements except hydrogen and oxygen by inspection in each half-reaction.
- Balance oxygen atoms by adding water molecules (H2O).
- Balance hydrogen atoms by adding protons (H+).
- Convert the reactions to basic conditions by adding hydroxide ions (OH-) to both sides to neutralize all H+ ions.
- Combine the H+ and OH- ions to form water molecules (H2O) and place the water on one side of the equation.
- Balance the charge in each half-reaction by adding electrons (e-).
- Multiply each half-reaction to equalize the number of electrons in both reactions.
- Combine the half-reactions, canceling out common species on both sides of the equation to obtain the balanced overall redox reaction.
Balancing the Redox Reaction
- The oxidation half-reaction: Zn + 4OH- → Zn(OH)42- + 2e-
- The reduction half-reaction: NO3- + 6H2O + 8e- → NH3 + 9OH-
- The balanced redox reaction: 4Zn + 7OH- + NO3- + 6H2O → 4Zn(OH)42- + NH3
Checking the Balanced Reaction
- Ensure all elements and charges are balanced.
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Description
Explore the processes of identifying oxidation and reduction species in redox reactions, particularly in basic aqueous solutions. This quiz will guide you through balancing these reactions step-by-step, ensuring a clear understanding of the conversion of half-reactions into balanced equations.
