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Aqua regia is a mixture of concentrated HNO3 and HCl developed to dissolve gol…

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Wize University Chemistry Textbook > Electrochemistry

Balancing Redox Reactions

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Aqua regia is a mixture of concentrated HNO3 and HCl developed to dissolve gold. The process is a redox reaction as follows:
Au(s)+NO3(aq)−+Cl(aq)−→AuCl4(aq)−+NO2(g)Au_{(s)}+NO^-_{3(aq)}+Cl^-_{(aq)} \to AuCl^-_{4(aq)}+NO_{2(g)}
Balance this reaction under acidic conditions and identifying the oxidized and reduced species.
More Balancing Redox Reactions Questions:
Electrochemistry: Redox
Balance the following redox reaction in basic solution:
Cr(OH)3 + Br2 → CrO42- + Br- in basic solution
Electrochemistry: Redox
Balance the following redox reaction in an acidic solution.
HCOOH + MnO4- --> CO2 + Mn2+
Thermodynamics: Work Done During Acid Digestion of Magnesium
A 10.0 g piece of Mg(s) is deposited in a container with a vast excess of HCl(aq). A reaction takes place forming hydrogen gas and Magnesium Chloride.
a) Write a balanced chemical reaction for the transformation
b) Calculate the work done by the system as a consequence of the reaction, if Pex = 1.1 atm and T = 298.15 K. You may assume ideal behaviour.
Balance the following redox reaction in basic solution:
Cr(OH)3 + Br2 --> CrO42- + Br- in basic solution
Balance the following redox reaction in an acidic solution.
HCOOH + MnO4- --> CO2 + Mn2+
Electrochemistry: Balancing Redox Reactions (Basic)
Balance the following redox reaction under basic condition:
Sn(OH)3− (aq) + Bi(OH)3 (s) → Sn(OH)62− (aq) + Bi (s)
Balance the following redox reaction:
HBrO (aq) → Br− (aq) + O2 (g) under acidic condition
Balancing Redox Reactions (Basic)
Balance the following redox reactions under basic condition:
Cl2 (aq) → ClO3− (aq) + Cl− (aq)
Sn(OH)3− (aq) + Bi(OH)3 (s) → Sn(OH)62− (aq) + Bi (s)
Balancing Redox Reactions (Acidic)
Balance the following redox reactions under acidic condition:
H2S (aq) + H2O2 (aq) → S (s) (acidic solution)
P4 (s) + NO3− (aq) → H3PO4 (aq) + NO (g) (acidic solution)
Balance the following redox reaction in acidic conditions. What is the coefficient on H+?
Cr2O9 2−(aq)+HNO2(aq)→Cr3+(aq)+NO3 −(aq){\small \text{Cr}_2\text{O}_9\ ^{2-}\text{(aq)} + \text{HNO}_2\text{(aq)} \rightarrow \text{Cr}^{3+}\text{(aq)} + \text{NO}_3\ ^-\text{(aq)}}
Consider the following unbalanced equation:
Zn (s) + NO3− (aq) + H+ (aq) → Zn2+ (aq) + NH4+ (aq) + H2O (l)
Write the net ionic and complete molecular reaction
Redox Balance
Consider the unbalanced redox reaction shown below.
IO3− (aq) + HSO3−(aq) → I−(aq) + SO42−(aq) (in acidic solution)
When the equation is balanced with the smallest whole number coefficients, what is the coefficient of SO42− ?