Analisis penentuan asam oksalat dengan potensiometer (Titrino/Titroprocessor)

Peralatan :
Potentiometer = 751 GPD Titrino / Titroprocessor
Electrode = 6.0232.100 combined pH glass electrode; input 1

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

Sampel :
2 mL c(C2H2O4) = 0.1 mol/L; HOOC-COOH pK1 = 1.42, pK2 = 4.31
50 mL dist. water

Rangkuman :

Perhitungan:

Oxalic=EP2*C01*C37/C02/C00;3;mol/L

Oxalic = concentration of oxalic acid in mol/L
C01 = concentration of titrating agent (0.1 mol/L)
C02 = factor for “normality“ (2)
C37 = titer of titrating agent (1.0013 common variable of “Tit.NaOH“)
Compare also titration in non aqueous medium, application No. 1-5
For pK determinations, the electrode should be calibrated.

Jawaban :

Oxalic = 4.098 x 0.1 x 1.0013 / 2 / 2 = 0.103 mol/L

EP1 = 2.110 mL
EP2 = 4.098 mL
C00 = 2 mL

Literatur:
Metrohm’s Teachware on CD-ROM