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Ch.4 - Reactions in Aqueous Solution
Chapter 4, Problem 105a

Suppose you have 3.00 g of powdered zinc metal, 3.00g of powdered silver metal and 500.0 mL of a 0.2 M copper(II) nitrate solution. (a) Which metal will react with the copper(II) nitrate solution?

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Reactivity of Metals

The reactivity of metals is determined by their ability to lose electrons and form positive ions. In a displacement reaction, a more reactive metal can displace a less reactive metal from its compound. Understanding the reactivity series of metals helps predict which metal will react with a given solution.
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Transition Metals

Displacement Reactions

Displacement reactions occur when a more reactive element displaces a less reactive element from a compound. In this scenario, zinc and silver are compared to copper(II) ions in the solution. The metal that is higher in the reactivity series will replace the copper ions, leading to the formation of a new compound.
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Single Displacement Reactions

Molarity and Stoichiometry

Molarity is a measure of concentration, defined as moles of solute per liter of solution. In this question, the concentration of copper(II) nitrate is given, which is essential for calculating the number of moles available for reaction. Stoichiometry allows us to relate the amounts of reactants and products in a chemical reaction, helping to determine the limiting reactant.
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Related Practice
Textbook Question

Citric acid, C6H8O7, is a triprotic acid. It occurs naturally in citrus fruits like lemons and has applications in food flavouring and preservatives. A solution containing an unknown concentration of the acid is titrated with KOH. It requires 23.20 mL of 0.500 M KOH solution to titrate all three acidic protons in 100.00 mL of the citric acid solution. Write a balanced net ionic equation for the neutralization reaction.

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Textbook Question

Citric acid, C6H8O7, is a triprotic acid. It occurs naturally in citrus fruits like lemons and has applications in food flavouring and preservatives. A solution containing an unknown concentration of the acid is titrated with KOH. It requires 23.20 mL of 0.500 M KOH solution to titrate all three acidic protons in 100.00 mL of the citric acid solution. Calculate the molarity of the citric acid solution.

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Textbook Question
(c) If 18.65 mL of the caesium hydroxide solution was needed to neutralize a 42.3 mL aliquot of the hydroiodic acid solution, what is the concentration (molarity) of the acid?
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Textbook Question

Suppose you have 3.00 g of powdered zinc metal, 3.00g of powdered silver metal and 500.0 mL of a 0.2 M copper(II) nitrate solution. (d) What is the molarity of Cu2+ ions in the resulting solution?

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Textbook Question

(a) By titration, 15.0 mL of 0.1008 M sodium hydroxide is needed to neutralize a 0.2053-g sample of a weak acid. What is the molar mass of the acid if it is monoprotic?

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Textbook Question

(b) An elemental analysis of the acid indicates that it is composed of 5.89% H, 70.6% C, and 23.5% O by mass. What is its molecular formula?

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