Noorganik kimyo kafedrasi analitik kimyo laboratoriya ishlanmalar

Ishni bajarish tartibi. Aralashma tarkibiga kirgan kationlarning aniq konsentratsiyali eritmalari (100 ml hajmda 1-5 mg bo'lgan) ularning kimyoviy toza nusxalaridan yuqoridagi tartibda 0,5 % jelatinadan 20 tomchi qo‘shilgandan so‘ng ammiakli bufer eritma bilan suyultirilib tayyorlanadi. Tayyorlangan eritmalardan quruq elektrolitik bo‘g‘inga 20 ml solinib, unga 0,5 g natriy sulfit qo‘shiladi va 5 daqiqadan so‘ng tekshiriladigan eritmaning polyarogrammasi tushirilish sharoitida standart eritmaning polyarogrammasi tuziladi. Poryarogrammalarning balandliklari o‘lchanadi.
Analiz natijalarini hisoblash. Kationlarning eritmadagi massalari quyidagi formula yordamida aniqlanadi:


m=c₀h_xV_k/h₀

bu yerda, V_k - tekshiriladigan eritmaning umumiy hajmi, ml.

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Hulosa ____________________________________________________________ ____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________
№7. Laboratoriya ishi
Fоtоmеtrik аnаliz mеtоdlаri.
Eritmаdаgi tеmir yoki nikеl (III) iоnlаri miqdоrini аniqlаsh