1. Review of Diprotic Acid Titration

2. Analysis of 0.181g Carbonate / Bicarbonate Sample
# mol HCO3- = ( L) x ( M) x (1 mol HCO3- / 1 mol HCl)
= mol HCO3-
# mole CO32- = ( L) x ( M) x (1 mol CO32- / 1 mol HCl)
= mol CO32-
# mole HCO3- in original mixture
= # mol HCO # mol HCO3- produced in titration to Phen. End Pt.
= # mol HCO # mol CO32-
= mol mol = mol HCO3-
  #g NaHCO3 = ( mol) x ( g/mol) = g
#g Na2CO3 = ( mol) x ( g/mol) = g
  wt% NaHCO3 = (0.102g / 0.181g) x 100 = %
wt % Na2CO3 = (0.072g / 0.181g) x 100 = %

3. Complexometric Titration

4. Typical Complexing Agents

5. EDTA

8. Ca-EDTA Titration

9. 0.00 mL Titrant Added
Titration Reaction
EDTA Ca2+ CaEDTA2+
end = 0 M = M = 0 M
Equilibrium Reaction
Initial
[Ca2+] = M
Concentration
pCa = - log( ) = 2.30

10. 25.00 mL Titrant Added (Equivalence Point)
Titration Reaction
EDTA Ca2+ CaEDTA2+
start (0.0100M)( L) (0.0050M)( L)
= mol = mol = 0 mol
end 0 mol 0 mol mol
( mol)/( L)
= 0 M = 0 M = M
Equilibrium Reaction
EDTA Ca2+ CaEDAT2+
Initial
Change + x + x - x
Equilibrium x x ~
1.75 x = ( ) / x2
x = [Ca+] = 4.36 x 10-7 M
Concentration
pCa = - log(4.36 x 10-7) = 6.36

11. 50.00 mL Titrant Added
Titration Reaction
EDTA Ca2+ CaEDTA2+
start (0.0100M)( L) (0.0050M)( L)
= mol = mol = 0 mol
end mol 0 mol mol
( mol)/(0.1000L) ( mol)/(0.1000L)
= M = 0 M = M
Equilibrium Reaction
EDTA Ca2+ CaEDAT2+
Initial
Change + x + x - x
Equilibrium ~ x ~
1.75 x = ( ) / ( ) x
x = [Ca+] = 5.71 x M
Concentration
pCa = - log(5.71 x 10-11) =

13. Indicators