Acid-Base Titrations and Neutralization Reactions Summary

  • PBL and Exam Dates

    • PBL due on 4/4
    • Acid/Base Summative on 4/4

  • Neutralization Reactions

    • Type: Double replacement reaction
    • Reactants: Acid + Base
    • Products: Water + Salt (ionic compound)

  • Titrations

    • Purpose: Determine concentration of unknown solution
    • Process: Measure known solution quantity, add unknown until neutralization
    • Endpoint: Equivalence point where neutralization occurs

  • Indicators

    • Used to identify equivalence point in titrations
    • Example: Phenolphthalein (colorless in acid, pink in base)

  • Titration Calculations

    • Formula:
      (coefficient from base)×MA×VA=MB×VB×(coefficient from acid)(coefficient \text{ from base}) \times MA \times VA = MB \times VB \times (coefficient \text{ from acid})
    • Variables:
    • $MA$: Molarity of acid
    • $MB$: Molarity of base
    • $VA$: Volume of acid (L)
    • $VB$: Volume of base (L)

  • Example Problem

    • Given:
    • Buret: 6.00 M Al(OH)3
    • Initial Volume: 5.80 mL
    • Final Volume: 48.8 mL
    • H2SO4 sample: 25.0 mL
    • Reaction:
      3H2SO4+2Al(OH)3→6H2O+Al2(SO4)33 H2SO4 + 2 Al(OH)3 \rightarrow 6 H2O + Al2(SO4)3
    • Volume of Al(OH)3 used:
      48.8mL−5.80mL=43.0mL48.8 mL - 5.80 mL = 43.0 mL
    • Conversion:
      0.0430 L0.0430 \text{ L}
    • Calculation:
      2×MA×0.0250L=3×6.00M×0.0430L2 \times MA \times 0.0250 L = 3 \times 6.00 M \times 0.0430 L
    • Result: Approximately 15.5 M H2SO4