Lecture 19.1a- Acid/Base Properties

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Section 19.1 lecture (part A) for Honors & Prep Chemistry

Section 19.1 lecture (part A) for Honors & Prep Chemistry

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  • 1. 19.1 Lecture 19.1a- Properties of Acids and Bases Acids taste sour, will change the color of an acid-base indicator, and can be strong or weak electrolytes in aqueous solution.
  • 2. 19.1 Citrus fruits contain citric acid. Tea contains tannic acid.
  • 3. 19.1 Bases taste bitter, feel slippery, will change the color of an acid-base indicator, and can be strong or weak electrolytes in aqueous solution.
  • 4. Antacids use bases to neutralize excess stomach acid. The base calcium hydroxide is a component of mortar.
  • 5. The Arrhenius definition of ACIDS AND BASES Acids dissociate to produce H+ HCl  H+ + Cl- Bases dissociate to produce OH- NaOH  Na+ + OH-
  • 6. HCl  H+ + Cl- Or HCl + H2O  H3O+ + Cl- H+ and H3O+ mean the same thing
  • 7. H + is a proton Acids form H+ which attaches to water forming the hydronium ion H+ + H2O  H3O+ hydronium ion H+ and H3O+ mean the same thing
  • 8. An acidic hydrogen can dissociate from the acid as H+. Acidic hydrogens are written first in the chemical formula. HNO3 = monoprotic acid H2SO4 = diprotic acid H3PO4 = triprotic acid HC2H3O2 = monoprotic protic aka proton
  • 9. 19.1 Stomach acid Battery acid In soda pop Acetic acid Vinegar Makes bubbles in carbonated beverages
  • 10. 19.1 Arrhenius Bases Hydroxide ions are one of the products of the dissolution of an alkali metal in water.
  • 11. 19.1
  • 12. Milk of magnesia is a base used as an antacid.
  • 13. When acids and bases are mixed they react to form water in a Neutralization reaction NaOH + HCl  H2O + NaCl(aq) An acid/base reaction always forms water and an aqueous salt The net ionic equation for an acid/base reaction is H+ + OH-  H2O
  • 14. PROPERTIES OF ACIDS AND BASES ACIDS BASES Produce H+ Produce OH- pH below 7 pH above 7 Sour taste Bitter taste H+ + some metals = H2(g) Slippery feel Litmus paper red Litmus paper blue React with base to React with acid to form water and salt form water & salt BOTH ACIDS AND BASES ARE ELECTROLYTES