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The Dissociation Constant of p-Nitroanilinium Ions in Water-Sulfolane Solvents at 25ºC

Saudi Arabia

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Abstract

The dissociation constants of p-nitroanilinium ions have been determined in water-sulfolane mixtures at 25oC using spectro- photometric method. The p(K)BH+ is found to decrease with pro- gressive addition of sulfolane which indicates that the basicity of the medium is increased by the addition of sulfolane. The relative basicity of the medium is compared with other water-solvent mixtures and it is found that the basicity decreases in the order of: NMH-H 2 O > THF-H 2 O > DMF - H 2 O > ECS-H 2 O > AN-H 2 O > Sulfolane - H2O > HAc-H2O The acidity function, Ho, of HCl in H2O-sulfolane mixtures is also determined and is found to increase with increase of the organic sol- vent component for a fixed acid concentration. This is explained due to the salting in effect, which differs with the organic solvent. It showed a decrease in the order of: NMF > DMSO > DMF > Dioxan > ECS > EtOH = Acetone > Sulfolane.

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What this paper is about

The dissociation constants of p-nitroanilinium ions have been determined in water-sulfolane mixtures at 25oC using spectro- photometric method. The p(K)BH+ is found to decrease with pro- gressive addition of sulfolane which indicates that the basicity of the medium is increased by the addition of sulfolane. The relative basicity of the medium is compared with other water-solvent mixtures and it is found that the basicity decreases in the order of: NMH-H 2 O > THF-H 2 O > DMF - H 2 O > ECS-H 2 O > AN-H 2 O > Sulfolane - H2O > HAc-H2O The acidity function, Ho, of HCl in H2O-sulfolane mixtures is also determined and is found to increase with increase of the organic sol- vent component for a fixed acid concentration. This is explained due to the salting in effect, which differs with the organic solvent. It showed a decrease in the order of: NMF > DMSO > DMF > Dioxan > ECS > EtOH = Acetone > Sulfolane.

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Available abstract

The dissociation constants of p-nitroanilinium ions have been determined in water-sulfolane mixtures at 25oC using spectro- photometric method. The p(K)BH+ is found to decrease with pro- gressive addition of sulfolane which indicates that the basicity of the medium is increased by the addition of sulfolane. The relative basicity of the medium is compared with other water-solvent mixtures and it is found that the basicity decreases in the order of: NMH-H 2 O > THF-H 2 O > DMF - H 2 O > ECS-H 2 O > AN-H 2 O > Sulfolane - H2O > HAc-H2O The acidity function, Ho, of HCl in H2O-sulfolane mixtures is also determined and is found to increase with increase of the organic sol- vent component for a fixed acid concentration. This is explained due to the salting in effect, which differs with the organic solvent. It showed a decrease in the order of: NMF > DMSO > DMF > Dioxan > ECS > EtOH = Acetone > Sulfolane.

Key concepts: Sulfolane, Chemistry, Dissociation constant, Dissociation (chemistry), Solvent, Ion, Inorganic chemistry, Acetone

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