Analisis calsium dg alat Titrino / titroprocessor

Alat yg digunakan
Potentiometer = 751 GPD Titrino / Titroprocessor
Electrodes = 6.0430.100 Ag Titrode amalgamated; input 1

Pereaksi
c(Na2EDTA) = 0.1 mol/L; D0
Sample 2 mL c(CaCl2) = 0.1 mol/L
10 mL buffer pH = 10
40 mL dist. Water

Remarks

· Calculations:

c(Ca++)=EP1*C01/C00;3;mol/l

Ca++ = concentration of Ca2+ in mol/L
C01 = concentration of titrating agent (0.1 mol/L)

. Answer

c(Ca++) = 2.043 x 0.1/2 = 0.102mol/L

EP1=2.043 mL
C00=2.000 mL
· Coating of Ag Titrode: Clean Ag Titrode first by immersing it in conc. HNO3, then immerse it shortly in Hg.
· Buffer pH = 10: Dissolve 54 g NH4Cl and 350 mL w(NH3) = 0.25 (25%) in dist water and fill up of 1 liter. · If several metal ions which form EDTA complexes are present, their sum is determined. · For a greater break, add Hg-EDTA complex.

Literature
Metrohm’s Teachware on CD-ROM