Chemistry 104 Laboratory

 

 

This Week

Answer Keys

Gen Chem Lab

Periodic Table

 

 

 

á       Expt 5:  pH Titration

á       Quiz 2:  Experiment 1

 

Next Week

á       Expt 6:  Solubility and Thermodynamics

á       Thermodynamics of a Rubber Band

 

Notes for Today
  • Overall Goals
    • Explore acid-base equilibria through titration curves
    • Use titration curve to identify an unknown acid or base

 

 

  • pH Titration Curve
    • Plot of how pH changes over the course of an acid-base rxn

          e.g., HCl + NaOH --> H2O + NaCl

 

       

 

 

    • Molar mass comes from equivalence point information
    • pK comes from pH at half equivalence

 

 

  • pH at any point can be predicted

Ka = [H+][A-]/[HA]

-log(Ka) = -log[H+] + {log([A-]/[HA])}

pKa = pH - log([A-]/[HA])

pH = pKa + log([A-]/[HA]