Analisis penentuan Ca2+ dg alat Poensiometer (Titrino/Titroprocessor)

Peralatan :
Potentiometer = 751 GPD Titrino / Titroprocessor
Electrode = 6.0430.100 Ag Titrode amalgamated; input 1

Pereaksi :
c(Na2EDTA) = 0.1 mol/L; D0

Sampel :
2 mL c(CaCl2) = 0.1 mol/L 10 mL
buffer pH = 10
40 mL dist. Water

Rangkuman :
· Perhitungan :

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

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

. Jawaban :

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.

Literatur :

Metrohm’s Teachware on CD-ROM