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Dive into the research topics where Viktoria Klara Lakatos Osorio is active.

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Featured researches published by Viktoria Klara Lakatos Osorio.


Química Nova | 2001

Polifosfatos em detergentes em po comerciais

Viktoria Klara Lakatos Osorio; Wanda de Oliveira

A didactic experiment is proposed in order to identify inorganic phosphates in home laundry detergents by ascending paper chromatography. Chemical principles related with hard water are also investigated. The role of polyphosphates in detergent formulations is discussed and the softening of hard water by sodium tripolyphosphate is illustrated. Several chemical concepts, related to the daily experience of the students, can be explored in post-lab discussions.


Polyhedron | 1996

The ion-pair association constant of oxalate with fac-tris(2-aminomethylpyridine)cobalt(III)

Maria Amélia de Almeida Azzellini; Maria de Fátima Paredes de Oliveira; Neyde Yukie Murakami Iha; Viktoria Klara Lakatos Osorio

The equilibrium constant K for the ion-pair formation fac-[Co(pic)3]3+ + C2O22− ⇌ fac-[Co(pic)3]3+/C2O42−1 where pic = 2-aminomethylpyridine, has been determined spectrophotometrically at 0.35 M (KCl) ionic strength and 25.0°C, using four different calculation approaches. The best results were obtained when the concentration of the minor component (the cobalt complex ion) was not neglected in comparison with the oxalate ion concentration. The value of K (5.3 M−1) increases when the supporting electrolyte is LiCl (K = 8.2 M−1). The effect of the ionic strength variation from 0.35 to 2.0 M (LiCl) was also investigated.


Química Nova | 2003

Decomposição térmica do bicarbonato de sódio: do processo Solvay ao diagrama tipo Ellingham

Alessandra de Souza Maia; Viktoria Klara Lakatos Osorio

A didactic experiment based on the thermal decomposition of sodium bicarbonate using a reagent found in the marketplace is proposed. The reaction products are identified by qualitative tests and stoichiometric calculations. The thermal stability of carbonates and the influence of lattice energies are discussed, emphasizing periodic trends in the alkali and alkaline earth families. The industrial importance of the reaction is also explored.


Polyhedron | 1987

Dialkyl sulfoxides complexes with nickel(II) nitrate and perchlorate

Denise de Oliveira; Viktoria Klara Lakatos Osorio

Abstract Nickel(II) perchlorate and nitrate complexes containing dimethyl, di- n -propyl, di- n -butyl, di- i -butyl and di- t -butyl sulfoxides have been synthesized and characterized by IR and electronic spectroscopies, magnetic-susceptibility and electrolytic-conductance measurements. In the complexes containing perchlorate, the metal: sulfoxide molar ratio is 1:6 and the perchlorate groups are ionic. In the nitrate compounds, the molar ratio decreases from 1:6 to 1:2 according to the increase in the steric bulk of the alkyl group from methyl to t -butyl. The nitrate group may either be non-coordinating or behave as a monodentate or bidentate ligand. All the complexes contain O-bonded sulfoxide molecules and are characterized as high-spin, with an octahedral or distorted octahedral geometry. The dialkyl sulfoxides studied in this work fall in the same position as dimethyl sulfoxide in the spectrochemical and nephelauxetic series. Electrolytic conductivities suggest that the compounds containing ionic nitrate exhibit sulfoxide—nitrate exchange in nitromethane solutions.


Química Nova | 2009

Eletrodo de hidrogênio: o que há nos livros didáticos além de E¸ = 0?

Wanda de Oliveira; Peter W. Tiedemann; Renato Giovanni Cecchini; Viktoria Klara Lakatos Osorio

The results of an exercise on electrochemistry for General Chemistry students are presented. The difficulty encountered by students in predicting the shift in the potential of the hydrogen electrode under non-standard conditions prompted a search in textbooks on how the subject is developed. Besides several instances of inconsistencies in defining the standard state, such as including the temperature in the definition, a number of incorrect depictions of the hydrogen electrode were discovered. Of the 28 General Chemistry books, 16 Physical Chemistry books and 24 Internet pages, 30, 20 and 46%, respectively, showed devices that would not work in practice.


Química Nova | 2009

Alameda Glette, 463, sede do Curso de Química da Universidade de São Paulo no período 1939-1965

Viktoria Klara Lakatos Osorio

As the foundation of the University of Sao Paulo completes 75 years, this article describes the history of a mansion at 463 Glette Boulevard, in Sao Paulo city, where several undergraduate courses of the Universitys Philosophy, Sciences and Letters Faculty operated until 1969. The first building of the school of Chemistry was erected there, 70 years ago. A brief retrospective of the Department of Chemistry at that place is given. The mansion was torn down by the middle of the 1970s, but it remained as a symbol of the school identity in the memory of all those who studied there.


Journal of Inorganic and Nuclear Chemistry | 1977

Vibrational spectra of dimethyl sulfoxide complexes of some lanthanide nitrates

Yoshio Kawano; Viktoria Klara Lakatos Osorio


Journal of Chemical Education | 2005

Hard Water and Soft Soap: Dependence of Soap Performance on Water Hardness. A Classroom Demonstration

Viktoria Klara Lakatos Osorio; Wanda de Oliveira; Omar A. El Seoud; Wyatt Cotton; Jerry Easdon


Journal of Chemical Education | 2007

Primo Levi and The Periodic Table: Teaching Chemistry Using a Literary Text.

Viktoria Klara Lakatos Osorio; Peter W. Tiedemann; Paulo Alves Porto


Química Nova | 2003

Um experimento-charada usando data-show e resinas de troca iônica

Viktoria Klara Lakatos Osorio; Miuaco K. Kuya; Alessandra de Souza Maia; Wanda de Oliveira

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