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Redoxokinetic titration of hydrochloric, acetic and phosphoric acid with sodium hydroxide

✍ Scribed by K.K. Janardhanan Pillai; A.S. Lakshmanan; C.V. Suryanarayana


Publisher
Elsevier Science
Year
1970
Tongue
English
Weight
399 KB
Volume
15
Category
Article
ISSN
0013-4686

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✦ Synopsis


The redoxokinetic technique has been used for titrating (i) a mixture of hydrochloric and acetic acids against sodium hydroxide and (ii) orthophosphoric acid against sodium hydroxide; the results compare favourably with the potentiometric method. It is however necessary to use a high applied voltage, > 500 mV, in the redoxokinetic titrations; lower voltages do not give significant infiexions. R&sum&La technique redoxo-cin&ique est utilisQ aux titrages (1) d'un melange d'acide chlorhydrique et d'acide ac&ique par la soude (2) de l'acide orthophosphorique par la soude. LR9 r&ultats sont en bon accord avec la methode potentiom&rique. I1 est cependant n&essaire, pour les dosages r6doxo-cinbtiques, d'imposer une tension elev& (> 500 mV): pour des tensions plus basses, on n'obtient pas d'infiexions sign&at&s. Zusammeafassrmg-Mit einer redoxokinetischen Methode wurden ein Gemisch von Salzs%ure und Essigs&ue sowie Orthophosphorsaure gegen Natronlauge titriert. Die Ergebnisse stimmen ziemlich gut mit potentiometrischen Messungen Uberein. Es muss jedoch mit grossen Potentialen (~500 mV) gearbeitet werden, kleinere Potentiale ergeben keinen signifikanten Umschlagspunkt.


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