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Understanding Acids, Bases, and the pH Scale: Indicators, Reactions, and Characteristics

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This guide provides an overview of acids, bases, and the pH scale, highlighting the concentration of hydronium ions and the characteristics of various substances. The pH scale ranges from 0 (acidic) to 14 (basic), with 7 being neutral. You’ll learn about indicators like litmus paper and phenolphthalein, common acids (e.g., HCl, H2SO4) and bases (e.g., NaOH, KOH), their reactions, tastes, and applications. The guide also covers neutralization reactions and the formation of salts, enriching your understanding of these fundamental concepts in chemistry.

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Understanding Acids, Bases, and the pH Scale: Indicators, Reactions, and Characteristics

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Presentation Transcript

  1. Acids and Bases

  2. pH Scale • Indicates the concentration of hydronium ions in a solution. • Goes from 0 (acidic) to 14 (basic) • 7 is considered neutral (water)

  3. Litmus Paper • Used to determine the pH of a solution. • Red litmus paper= red in acid and neutrals, blue in base. • Blue litmus paper= red in acid, blue in a base or neutral.

  4. Phenolphthalein • Another indicator • Turns bright pink in the presence of a base. • Remains colorless in the presence of an acid.

  5. Acids • Form H+ ions in water • pH below 7 • Strong acids have a pH between 1-3.

  6. Tastes sour • Reacts with active metals to form H gas and a metal compound – residue or corrosion.

  7. Common Acids • Sulfuric acid (H2SO4) • Nitric acid (HNO3) • Hydrochloric acid (HCl)

  8. Found in: • Aspirin • Vitamin C • Citrus Fruits (oranges, lemons, grapefruits) • Vinegar • Carbonated drinks

  9. Strong Acids • HI • HBr • HCl • HNO3 • H2SO4 • HClO4

  10. Bases • pH above 7 • Strong bases have a pH range of 11-14. • Bitter taste • Slippery to the touch • Dissolves fats and oils by forming soap (helps to “cut” grease)

  11. Also known as alkalines • In water, bases form hydroxide (OH-) ions.

  12. Common bases • Potassium hydroxide • Sodium Hydroxide

  13. Found in • Drain cleaners • Antacids (Tums, Rolaids) • Deodorants • Ammonia • Soap

  14. Strong Bases • Group 1 and Group II hydroxides.

  15. Buffers • Solutions that contain ions that react with acids or bases to minimize their effects

  16. Neutralization • A chemical reaction between an acid and a base that takes place in a water solution.

  17. Salt • A compound formed when the negative ions from an acid combine with the positive ions of a base. • A salt is neutral HCl + NaHCO3 -----> NaCl + CO2 + H2O Acid + base ----- salt + water

  18. Acid or Base?

  19. Acid or base? Got Milk?

  20. Acid or Base?

  21. Identifying acids, bases, and salts • What do you notice about all acids? • Bases? • Salts?

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