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Consider the unbalanced redox reaction: MnO4-(aq) + Zn(s) → Mn2+(aq) + Zn2+(aq). Balance the equation and determine the volume of a 0.500 M KMnO4 solution required to completely react with 2.85 g of Zn.
Ch.19 - Electrochemistry
Chapter 19, Problem 109b
Determine whether HI can dissolve each metal sample. If it can, write a balanced chemical reaction showing how the metal dissolves in HI and determine the minimum volume of 3.5 M HI required to completely dissolve the sample. b. 4.85 g Cu
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Acid-Base Reactions
Acid-base reactions involve the transfer of protons (H+) between reactants. Hydroiodic acid (HI) is a strong acid that can donate protons, which can react with certain metals to form metal iodides and hydrogen gas. Understanding this concept is crucial for predicting whether a metal will dissolve in HI and for writing the balanced chemical equations for the reactions.
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01:09
Acid-Base Reaction
Stoichiometry
Stoichiometry is the calculation of reactants and products in chemical reactions based on the balanced equation. It allows us to determine the relationships between the amounts of substances involved. In this case, stoichiometry will help calculate the minimum volume of 3.5 M HI needed to dissolve a given mass of copper (Cu) by using the molar ratios from the balanced reaction.
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01:16Stoichiometry Concept
Molarity and Volume Calculations
Molarity (M) is a measure of concentration defined as moles of solute per liter of solution. To find the volume of HI required to dissolve the copper sample, one must convert the mass of copper to moles and then use the molarity of the HI solution to find the necessary volume. This concept is essential for practical applications in laboratory settings.
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03:12Molar Mass Calculation Example
Related Practice
Textbook Question
Consider the unbalanced redox reaction: Cr2O72-(aq) + Cu(s) → Cr3+(aq) + Cu2+(aq) Balance the equation and determine the volume of a 0.850 M K2Cr2O7 solution required to completely react with 5.25 g of Cu.
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Textbook Question
Determine whether HI can dissolve each metal sample. If it can, write a balanced chemical reaction showing how the metal dissolves in HI and determine the minimum volume of 3.5 M HI required to completely dissolve the sample. a. 2.15 g Al
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Textbook Question
Determine whether HI can dissolve each metal sample. If it can, write a balanced chemical reaction showing how the metal dissolves in HI and determine the minimum volume of 3.5 M HI required to completely dissolve the sample. c. 2.42 g Ag
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Textbook Question
Determine if HNO3 can dissolve each metal sample. If it can, write a balanced chemical reaction showing how the metal dissolves in HNO3 and determine the minimum volume of 6.0 M HNO3 required to completely dissolve the sample. a. 5.90g Au b. 2.55g Cu c. 4.83g Sn
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Textbook Question
The cell potential of this electrochemical cell depends on the pH of the solution in the anode half-cell. Pt(s) | H2(g, 1 atm) | H+(aq, ? M) || Cu2+(aq, 1.0 M) | Cu(s) What is the pH of the solution if Ecell is 355 mV?
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