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Understanding Acid-Base Reactions: Conjugates, Neutralization, and Acid Rain

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This chapter explores the fundamentals of acid-base reactions, detailing conjugate acids and bases, and the neutralization process between acids and bases. It highlights the characteristics of amphoteric compounds like water and explains the significance of relative strengths in acid-base interactions. It also addresses acid rain, outlining the sources of its precursor compounds, and discusses the environmental impacts such as erosion and ecosystem disruption caused by acidic precipitation.

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Understanding Acid-Base Reactions: Conjugates, Neutralization, and Acid Rain

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  1. Chapter 14 Acids & Bases Section 3 Acid-Base Reactions

  2. Section 3 Acid-Base Reactions Chapter 14 Objectives • Describe a conjugate acid, a conjugate base, and an amphoteric compound. • Explain the process of neutralization. • Defineacid rain, give examples of compounds that can cause acid rain, and describe effects of acid rain.

  3. Section 3 Acid-Base Reactions Chapter 14 Conjugate Acids and Bases • The species that remains after a Brønsted-Lowry acid has given up a proton is the conjugate base of that acid. acid conjugate base

  4. Section 3 Acid-Base Reactions Chapter 14 Conjugate Acids and Bases, continued • Brønsted-Lowry acid-base reactions involve two acid-base pairs, known a conjugate acid-base pairs. acid1 base2 base1 acid2

  5. Section3 Acid-Base Reactions Chapter 14 Neutralization Reactions

  6. Section 3 Acid-Base Reactions Chapter 14 Conjugate Acids and Bases, continued Strength of Conjugate Acids and Bases • The stronger an acid is, the weaker its conjugate base • The stronger a base is, the weaker its conjugate acid strong acid base acid weak base

  7. Section 3 Acid-Base Reactions Chapter 14 Conjugate Acids and Bases, continued Strength of Conjugate Acids and Bases, continued • Proton transfer reactions favor the production of the weaker acid and the weaker base. • stronger acid stronger base weaker acid weaker base • The reaction to the right is more favorable • weaker acid weaker base stronger acid stronger base • The reaction to the left is more favorable

  8. Section3 Acid-Base Reactions Chapter 14 Relative Strengths of Acids and Bases Relative Strengths of Acids and Bases

  9. Section 3 Acid-Base Reactions Chapter 14 Amphoteric Compounds • Any species that can react as either an acid or a base is described as amphoteric. • example: water • water can act as a base • acid1 base2 acid2 base1 • water can act as an acid • base1 acid2 acid1 base2

  10. Section 3 Acid-Base Reactions Chapter 14 Amphoteric Compounds, continued –OH in a Molecule • The covalently bonded IOH group in an acid is referred to as a hydroxyl group. • Molecular compounds containing —OH groups can be acidic or amphoteric. • The behavior of a compound is affected by the number of oxygen atoms bonded to the atom connected to the —OH group.

  11. Section3 Acid-Base Reactions Chapter 14 Oxyacids of Chlorine

  12. Section 3 Acid-Base Reactions Chapter 14 Neutralization Reactions Strong Acid-Strong Base Neutralization • In aqueous solutions, neutralization is the reaction of hydronium ions and hydroxide ions to form water molecules. • A salt is an ionic compound composed of a cation from a base and an anion from an acid.

  13. Section 3 Acid-Base Reactions Chapter 14 Acid Rain • NO, NO2, CO2, SO2, and SO3 gases from industrial processes can dissolve in atmospheric water to produce acidic solutions. • example: • Very acidic rain is known as acid rain. • Acid rain can erode statues and affect ecosystems.

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