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 Potenciometriska sērskābes un borskābes kopīga noteikšana

  • Potenciometriska sērskābes un borskābes kopīga noteikšana

     

    Samples6 Chemistry

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ID number:488426
 
Author:
Evaluation:
Published: 23.03.2015.
Language: Latvian
Level: College/University
Literature: n/a
References: Not used
Extract

Sērskābes un borskābes kopīga titrimetriska noteikšana
Šķīdumu, kas satur sērskābi un borskābi vispirms titrē ar nātrija hidroksīda šķīdumu, t.i., ar hidroksīdjonu šķīdumu. Sērskābe tiek notitrēta, bet borskābe ar hidroksīdjoniem praktiski nereaģē.
Pēc tam šķīdumam, kurā sērskābe ir notitrēta, pievieno mannītu. Izveidojas kompleksā boromannītskābe un šķīduma pH samazinās. Turpinot titrēšanu ar nātrija hidroksīda, t.i., ar hidroksīdjonu šķīdumu, tiek notitrēta booromannītskābe.
…

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