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 \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:
  3 H2SO4 + 2 Al(OH)3 \rightarrow 6 H2O + Al2(SO4)3
• Volume of Al(OH)3 used:
  48.8 mL - 5.80 mL = 43.0 mL
• Conversion:
  0.0430 \text{ L}
• Calculation:
  2 \times MA \times 0.0250 L = 3 \times 6.00 M \times 0.0430 L
• Result: Approximately 15.5 M H2SO4