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Understanding Acids and Bases in Solutions: Essential Concepts Explained

Learn about acids, bases, pH scale, neutralization reactions, dissociation, strength, indicators, and more in this comprehensive guide. Explore the characteristics of different types of solutions and their importance in chemistry.

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Understanding Acids and Bases in Solutions: Essential Concepts Explained

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  1. Acids and Bases Solutions of Chemical Energy

  2. What is an Acid? A substance that dissociates and produces H+ (protons) when in solution Examples: (strong acids) HCl, H2SO4, HNO3

  3. Dissociation of HCl HCl(aq) -> H+(aq) + Cl-(aq) Each mole of HCl will produce 1 mole of H+ What is different about H2SO4?

  4. What is a Base? A base is any substance that dissociates to produce OH- (hydroxide ions) in solution Examples: (strong bases) NaOH, LiOH, KOH

  5. Dissociation of NaOH NaOH(aq) -> Na+(aq) + OH-(aq) Each mole of NaOH will dissociate to produce 1 mole of OH-

  6. Neutralization Reactions: A type of double-replacement reaction that produces a “salt” and water from an acid and base HCl + NaOH ----> NaCl + H2O Acid + Base ----> Salt + Water

  7. Bases Taste Bitter (Soap) Acids Taste Sour (Sour Patch Kids, Lemons, Vinegar) Characteristics of Acids and Bases:

  8. Weak Acids and Bases • Do not completely dissociate • Are still dangerous energetic solutions • More common in nature • Acetic Acid (vinegar) • Citric Acid (lemon jucie) • Found in buffered solutions • Have pHs closer to 7 at higher solution concentrations

  9. pH Scale (Concentration of H+ ions) A pH of 7.0 is “neutral” A pH >7.0 is “basic” (The farther from neutral, the stronger the base) A pH <7.0 is “acidic” (The farther from neutral, the stronger the acid)

  10. Math of pH • -log(H+ concentration in moles/Liter) • Eg. 1.00 X 10-7 M, The pH is 7 • Eg. 1.00 X 10-1M, The pH is 1 • Eg. 1.00 X 10-14M, The pH is 14

  11. Strength of Acids and Bases Measured on the pH Scale Range from 1-14

  12. pH Indicators

  13. Each Indicator Changes at a Certain pH Range Indicators are helpful when performing Titrations

  14. Buffered solutions • Resist forming more H+ or OH- ions • Made from a weak acid and a salt • Very important to life (Blood is 7.35 – 7.45 pH)

  15. Equipment for Titrations: Used to measure unknown pH by comparison to a known Burets are used to measure highly accurate volumes of solutions

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