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Ch.5 - Introduction to Solutions and Aqueous Solutions
Tro - Chemistry: A Molecular Approach 6th Edition
Tro6th EditionChemistry: A Molecular ApproachISBN: 9780137832217Not the one you use?Change textbook
All textbooksTro 6th EditionCh.5 - Introduction to Solutions and Aqueous SolutionsProblem 68a
Chapter 5, Problem 68a

Complete and balance each gas-evolution equation. a. HNO3(aq) + Na2SO3(aq) →

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Identify the reactants: HNO_3 (aq) and Na_2SO_3 (aq).
Determine the products: The reaction between an acid (HNO_3) and a sulfite (Na_2SO_3) typically produces a salt (NaNO_3), water (H_2O), and sulfur dioxide gas (SO_2).
Write the unbalanced chemical equation: HNO_3 (aq) + Na_2SO_3 (aq) \(\rightarrow\) NaNO_3 (aq) + H_2O (l) + SO_2 (g).
Balance the equation: Start by balancing the number of sodium (Na) atoms, then balance the nitrogen (N) atoms, followed by the oxygen (O) and hydrogen (H) atoms.
Verify that the number of atoms for each element is equal on both sides of the equation to ensure it is balanced.

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Key Concepts

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

Gas-Evolution Reactions

Gas-evolution reactions are chemical reactions that produce a gas as one of the products. These reactions often involve the combination of an acid with a carbonate, sulfite, or other compounds that release gas when they react. Understanding the nature of the reactants and the expected gas products is crucial for predicting the outcome of these reactions.

Balancing Chemical Equations

Balancing chemical equations is the process of ensuring that the number of atoms for each element is the same on both sides of the equation. This is achieved by adjusting the coefficients of the reactants and products. A balanced equation reflects the law of conservation of mass, which states that matter cannot be created or destroyed in a chemical reaction.
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Acid-Base Reactions

Acid-base reactions involve the transfer of protons (H⁺ ions) between reactants. In the context of the given equation, nitric acid (HNO3) acts as an acid, while sodium sulfite (Na2SO3) can act as a base. Recognizing the roles of acids and bases in a reaction helps in predicting the products formed, including any gases that may evolve.
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Related Practice
Textbook Question

A 25.00-mL sample of an unknown H3PO4 solution is titrated with a 0.150 M NaOH solution. The equivalence point is reached when 22.97 mL of NaOH solution is added. What is the concentration of the unknown H3PO4 solution? The neutralization reaction is H3PO4(aq) + 3 NaOH(aq) → 3 H2O(l) + Na3PO4(aq)

Textbook Question

Complete and balance each gas-evolution equation. c. HBr(aq) + Na2S(aq) →

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Textbook Question

A 15.00-mL sample of an unknown HClO4 solution requires titration with 17.03 mL of 0.1000 M NaOH to reach the equivalence point. What is the concentration of the unknown HClO4 solution? The neutralization reaction is HClO4(aq) + NaOH(aq) → H2O(l ) + NaClO4(aq)

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What is the oxidation state of Cr in each compound? c. Cr2O3

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Assign oxidation states to each atom in each element, ion, or compound. Cl2, Fe3+, CuCl2, CH4, Cr2O72–, HSO4–

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