Ch.4 - Reactions in Aqueous Solution

McMurry8th EditionChemistryISBN: 9781292336145Not the one you use?Change textbook

McMurry 8th Edition

Ch.4 - Reactions in Aqueous Solution

Problem 131

Chapter 4, Problem 131

The concentration of the Sn2+ solution used in Problem 4.130 can be found by letting it react with a known amount of Fe2+. What is the molar concentration of an Sn2+ solution if 23.84 mL is required for complete reaction with 1.4855 g of Fe2O3?

Verified step by step guidance

Identify the balanced chemical equation for the reaction between Sn^{2+} and Fe_2O_3. The reaction involves the reduction of Fe^{3+} to Fe^{2+} and the oxidation of Sn^{2+} to Sn^{4+}.

Calculate the moles of Fe_2O_3 using its molar mass. The molar mass of Fe_2O_3 is approximately 159.69 g/mol.

Determine the moles of Fe^{3+} ions produced from Fe_2O_3. Since each mole of Fe_2O_3 produces 2 moles of Fe^{3+}, multiply the moles of Fe_2O_3 by 2.

Use the stoichiometry of the balanced equation to find the moles of Sn^{2+} that reacted. The stoichiometry will tell you the mole ratio between Sn^{2+} and Fe^{3+}.

Calculate the molar concentration of the Sn^{2+} solution by dividing the moles of Sn^{2+} by the volume of the Sn^{2+} solution in liters (23.84 mL = 0.02384 L).

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Key Concepts

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

Stoichiometry

Stoichiometry is the branch of chemistry that deals with the quantitative relationships between the reactants and products in a chemical reaction. It allows us to calculate the amounts of substances consumed and produced in a reaction based on balanced chemical equations. Understanding stoichiometry is essential for determining the molar concentration of solutions when given mass and volume data.

Molarity

Molarity is a measure of concentration defined as the number of moles of solute per liter of solution. It is expressed in units of moles per liter (mol/L). To find the molarity of the Sn2+ solution, one must convert the mass of Fe2O3 into moles and relate it to the volume of the Sn2+ solution used in the reaction, using stoichiometric coefficients from the balanced equation.

Redox Reactions

Redox reactions involve the transfer of electrons between two species, resulting in changes in oxidation states. In this context, the reaction between Sn2+ and Fe2O3 involves the reduction of Sn2+ and the oxidation of Fe3+. Understanding the principles of redox chemistry is crucial for determining how the reactants interact and for calculating the molar concentration of the Sn2+ solution based on the complete reaction with Fe2O3.

Related Practice

Textbook Question

Calcium levels in blood can be determined by adding oxa-late ion to precipitate calcium oxalate, CaC2O4, followed by dissolving the precipitate in aqueous acid and titrating the resulting oxalic acid (H2C2O4) with KMnO4: How many milligrams of Ca2+ are present in 10.0 mL of blood if 21.08 mL of 0.000 988 M KMnO4 solution is needed for the titration?

Standardized solutions of KBrO3 are frequently used in redox titrations. The necessary solution can be made by dissolving KBrO3 in water and then titrating it with an As(III) solution. What is the molar concentration of a KBrO3 solution if 28.55 mL of the solution is needed to titrate 1.550 g of As2O3? See Problem 4.128 for the balanced equation. (As2O3 dissolves in aqueous acid solution to yield H3AsO3: As2O3 + 3 H2OS 2 H3AsO3.)

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Textbook Question

A volume of 18.72 mL of 0.1500 M K2Cr2O7 solution was required to titrate a sample of FeSO4 according to the equation in Problem 4.126. What is the mass of the sample?

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Textbook Question

A compound with the formula XOCl2 reacts with water, yielding HCl and another acid H2XO3, which has two acidic hydrogens that react with NaOH. When 0.350 g of XOCl2 was added to 50.0 mL of water and the resultant solution was titrated, 96.1 mL of 0.1225 M NaOH was required to react with all the acid. (a) Write a balanced equation for the reaction of XOCl2 with H2O.

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Textbook Question

Dichromate ion, Cr2O7 2-, reacts with aqueous iron(II) ion in acidic solution according to the balanced equation What is the concentration of Fe2+ if 46.99 mL of 0.2004 M K2Cr2O7 is needed to titrate 50.00 mL of the Fe2+ solution?

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Textbook Question

Alcohol levels in blood can be determined by a redox reaction with potassium dichromate according to the balanced equation What is the blood alcohol level in mass percent if 8.76 mL of 0.049 88 M K2Cr2O7 is required for complete reaction with a 10.002 g sample of blood?

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