Document Type : Research Paper
Authors
University of Mosul - College of Education
Abstract
The project is concerned with the influence of temperature on the values of ionization
constants for some acidic and basic compounds at fixed solvent 10% ethanol in a mixture of ethanol
water. These imines are in a forms of syn and anti oximes and Schiff bases having a substituents on
benzene ring of primary amine as o , m , p- phenol , o , p-amine groups, p-nitro, o , m , p- methyl and
others.
The thermodynamics of ionization for compounds confirm that ionization reactions are
accompanied by an increase of parameters ΔGº and ΔHº. These mean that ionization reactions are non
spontaneous and endothermic respectively. Values of ΔS° can be either of negative or positive signs.
These values are discussed in details.
Main Subjects
- J.Chasemi, Sh. Ahmed, M.Kubista and A.Forootan (2003) Determination of acidity constants of 4-(2-pyridylazo) resorcinol in binary mixture. J.Chem.Eng.Data 48:5.
- G.Uolgyi, R.Ruzi, K.Box J.Comer, E.Bosch and K.Takacsnorak, (2007) Potentiometric and spectrophotometric pKa determination of water insoluble compound J.Anal.Chim.Acta 583: 418.
- A.S.P.Azzouz, M.S.Saead and Kh.I.Al-Niemi (2006) Determination of ionization constants for some aromatic Schiff bases derived from benzil J.Edu.Sci. 18(2):1.
- A.S.P.Azzouz and F.H.Al-Maree (2008) determination of structure of some oxime and phenol derived from benzyol acetone and dimedone by physical means (Arabic) J.Edu.Sci. 21(1):1.
- A.S.P.Azzouz, M.S.Saead and Kh.I.Al-Niemi (2006) Determination of ionization constants for aliphatic Schiff bases derived from benzil and some other acids J.Edu.Sci. 18(4):1.
- A.S.P.Azzouz and F.H.Maree (2008) Determination of Ka for some oximes and phenolic compounds derived from benzyol acetone and dimedone by conductimetry J.Edu.Sci. 21(1):1.
- A.S.P.Azzouz and A.N.Obed Agha (2008) The influence of temperature , pH and the type of oxime isomerism on the stability constants values of some azo dyes Nat.J.Chem. 30:251.
- K.J.Laidler and J.H.Meiser (1999) "Physical Chemistry", 3rd ed., Houchton Mifflin Company, New York.
- A.S.P.Azzouz and N.A.Al-Azzawi (2002) The envirmental factors affecting the pKa values of benzaldoximes J.Edu.Sci. 14(1):20.
- J.Hine, (1962), "Physical Organic Chemistry" , McGraw Hill Book Company, Inc, London, pp.33,50-65.
- H.J.S.Al-Mula (2008) Determination of Ka of some compounds derived from N-formyl pipyridine and study some factors affecting on their acidity M.Sc, Thesis, Mosul University.
- A.S.P.Azzouz and Kh.I.Al-Niemi (2004) Determination of pKa values of a new imines and dibenzamide derivative using a novel potentiometric method J.Edu.Sci. 16(1):59.
- A.Albert and E.P.Serjeant (1984) The determination of ionization constants 3rd ed. Chapman and Hill London.
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