Analisis asam oxalat dg alat Titrino / Titroprocessor

Alat yang digunakan

Potentiometer = 751 GPD Titrino / Titroprocessor

Electrodes = 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
Calculations:

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.

Answer

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

Literature

Metrohm’s Teachware on CD-ROM