Dushanbe, Tajikistan
Dushanbe, Tajikistan
Dushanbe, Tajikistan
Dushanbe, Tajikistan
Dushanbe, Tajikistan
Kislotno-osnovnye svoystva limonnoy kisloty izucheny metodom potenciometricheskogo titrovaniya pri temperature 298 K i koncentraciyah S(H3Cit(ON)) 0,01 i 0,02 mol'/l. Ustanovleno, chto rezul'taty potenciometricheskogo titrovaniya zavisyat ot koncentracii veschestv i vremeni ustanovleniya ravnovesnogo znacheniya rN titruemogo rastvora. Pokazano, chto potenciometricheskim metodom mogut byt' opredeleny tri karboksil'nye gruppy limonnoy kisloty, kotorym sootvetstvuyut pKa1, pKa2 i pKa3. Znacheniya pokazateley konstant dissociacii limonnoy kisloty dlya koncentracii 0,02 mol'/l sostavlyayut 2,75; 4,45 i 5,82. Dlya obeih izuchennyh koncentraciy limonnoy kisloty postroeny diagrammy raspredeleniya dissociirovannyh form. Soglasno poluchennym dannym, krivye raspredeleniya s povysheniem koncentracii kisloty smeschayutsya po shkale rN napravo.
potenciometriya, limonnaya kislota, koncentraciya, konstanty ionizacii, rN, dissociirovannaya forma, nedissociirovannaya (molekulyarnaya) forma, funkcional'nye gruppy
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