The redox titration of Fe (II) ions with K2Cr2O7 using a potentiometry method the effect of EDTA and SCN- ligands

Herlina, Herlina and Razali, Muhammad (2024) The redox titration of Fe (II) ions with K2Cr2O7 using a potentiometry method the effect of EDTA and SCN- ligands. Pharmaciana, 14 (3). ISSN ISSN:2088-4559,e-ISSN:2477-0256

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Abstract

Complexometric titration is often used for determining the metal content, either through direct
titration or back titration. This study aimed to investigate redox titration between Mohr salt solutions
and potassium dichromate in an acidic atmosphere in the pH range 2. The results showed that the reaction
proceeded effectively at pH 2, with Mohr's salt solution acting as titrant. Furthermore, experiments were
conducted to compare the effectiveness of EDTA ligands and SCN- ligands in improving the sharpness
of the Fe2+/ Cr2O7
2- redox titration curve at pH 2. Results show that EDTA ligands are more effective
than SCN- ligands in improving the sharpness of the titration curve. However, it should be noted that
the addition of EDTA ligands can shift the equivalent point volume earlier, so adjustments need to be
made in redox titration analysis. The use of EDTA and SCN- ligands in the redox titration of Fe(II) ions
with K2Cr2O7 using a potentiometric method help in forming stable and detectable complexes with
Fe(II), leading to clear and reliable potentiometric measurements. Research has also shown that adding
excess moles of EDTA to total Fe (II) ions can decrease redox potential in Fe2+/ Cr2O7
2- systems. Based
on the volume at the equivalence point, the Fe2+ ion in Mohr salt is 14.30%. with an average titration
error of less than 0.30%. These results highlight the role of EDTA ligands in redox titration analysis and
their impact on redox potential changes. The use of EDTA and SCN- ligands in the redox titration of
Fe(II) ions with K2Cr2O7 using a potentiometric method help in forming stable and detectable
complexes with Fe(II), leading to clear and reliable potentiometric measurements

Item Type:	Artikel Umum
Subjects:	R Medicine > RS Pharmacy and materia medica
Divisi / Prodi:	Faculty of Pharmacy (Fakultas Farmasi) > S1-Pharmacy (S1-Farmasi)
Depositing User:	jurnal pharmaciana
Date Deposited:	19 Apr 2025 07:35
Last Modified:	19 Apr 2025 07:35
URI:	http://eprints.uad.ac.id/id/eprint/83047

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