Calculation of the concentration and dissociation constant of each acid group in a mixture from the pH titration curve of the mixture

Burton, J.O.; Acree, S. F.

doi:10.6028/jres.016.031

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1943

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“…The pH values in the range governed by the first dissociation constant are then obtained, as described in this paper, by the titration of the acid salt of the weak acid with nitric acid reagent. The determination of the concentration and dissociation constant of each acid group in a mixture [14) is improved by use of this procedure.…”

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confidence: 99%

Dissociation constants and pH-titration curves at constant ionic strength from electrometric titrations in cells without liquid junction: titrations of formic acid and acetic acid

Bates¹,

Siegel²,

Acree³

1943

J. RES. NATL. BUR. STAN.

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An improved method for obtaining the titration curves of monobasic acids is outlined. The sample, 0.005 mole of the sodium salt of the weak acid, is dissolver! in 100 ml of a 0.05-m solution of sodium chloride and titrated electrometrically with an acid-salt mixture in a hydrogen-silver-chloride cell without liquid junction.The acid-salt mixture has the composition: nitric acid, 0.1 m; pot assium nitrate, 0.05 m; sodium chloride, 0.05 m. The titration therefor e is performed in a. medium of constant chloride concentration and of practically unchanging ionicstr ength (1'=0.1) . The calculations of pH values and of dissociation constants from the emf values are outlined . The tit ration curves and dissociation constants of form ic acid and of acetic acid at 25 0 C were obtained by this method. The pK values (negative logarit hms of the d issociation constants) were found to be 3.742 and 4. 754, respectively.

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confidence: 99%