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NAMANGAN DAVLAT UNIVERSITETI
NOORGANIK KIMYO KAFEDRASI
ANALITIK KIMYO
LABORATORIYA ISHLANMALAR
(5140500-KIMYO BAKALAVR)
2021-2022 o’quv yili II semester uchun
II kurs (IV semestr)
NAMANGAN – 2021
Ismi: _______________________________________
Familyasi: ___________________________________
Guruhi: _____________________________________
Fan nomi: Analitik kimyo
Fan o’qituvchilari: _______________________ __________________________
Laboratoriya soati – 46
Mavzular
№
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Laboratoriya mavzulari
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Soati
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Max baho
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Olingan baho
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Topshirish sanasi
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O’qituvchi imzosi
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1
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Iоnоmеtriya. Kаtiоn yoki аniоnlаrni iоn-sеlеktiv elеktrоdlаr yordаmidа iоnini аniqlаsh.
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6
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5
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2
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Pоtеntsiоmеtriya. Kuchli yoki kuchsiz kislоtаlаr vа ishqоrlаr miqdоrini аniqlаsh
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6
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5
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3
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Оksrеdmеtrik (yоdni) yoki kоmplеksоnоmеtrik (Fе3+ iоnini) pоtеntsiоmеtrik titrlаsh.
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6
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5
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4
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Kоnduktоmеtriya. Sirkа kislоtаni bеvоsitа kоnduktоmеtrik аniqlаsh.
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6
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5
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5
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Amperometrik analiz. Kaliy bixromat miqdorini aniqlash
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4
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5
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6
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Pоlyarоgrаfik аnаliz mеtоdi. Аrаlаshmаdаgi mеtаllаrni sifаt vа miqdоriy аniqlаsh
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4
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5
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7
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Fоtоmеtrik аnаliz mеtоdlаri. Eritmаdаgi tеmir yoki nikеl (III) iоnlаri miqdоrini аniqlаsh
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6
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5
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8
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Eritmadagi temirning miqdorini spektrometrik usul bilan aniqlash
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4
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5
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9
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Fotometrik titrlash
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4
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5
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Jami
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46
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№1. Laboratoriya ishi
Ftorid yoki natriy ionini ionometrik aniqlash
Ftorid (natriy) ionining miqdorini aniqlash ftorid selektiv (natriyselektiv) elektrodning tegishli sistemalardagi potensialini o‘lchashga asoslangan. Analiz maxsus ionomer yordamida yoki potensiometr – pH metr yordamida bajarilishi mumkin. pH metrdan foydalanganda, uning shkalasini tegishli qiymatlarda darajalash kerak. Ionlarni aniqlashning mavjud kimyoviy usullari ko‘p mehnat va vaqt talab etadi. Biroq, ularning aniqligi va to‘g‘riligi kam. Ionlarni ionometrik aniqlash istiqbolli yo‘nalishdir.
Ftorid (natriy yoki boshqa) selektiv elektrodning potensiali tegishli ionning aktivligiga bog‘liq:
Doimiy ion kuchiga ega bo‘lgan eritmalar uchun
qiymat doimiy bo‘lishi mumkin (formal yoki real potensial). Real potensial har bir eritma uchun tegishli qiymatga ega bo‘ladi.
Ishni bajarish tartibi. Agar standart eritmalar tayyor bo‘lmasa, ular aniq namunalar olish yo‘li bilan 1 M konsentratsiyali eritmalarni ketma-ket suyultirish yordamida tayyorlanadi. Tayyorlangan 1 M eritmaning muayyan qismlarini 10 martadan ketma-ket suyultirib 0,1; 0,01; 0,001; 0,0001; 0,00001 M eritmalar hosil qilinadi. Eritmaning ion kuchini doimiy saqlab qolish uchun har bir eritmani atsetatli bufer aralashma yordamida suyultirish lozim. Shu eritmalarning har biri uchun elektrod potensiali o’lchanadi va E-lgC bog‘lanish asosida darajalash chizmasi tuziladi.
So‘ngra tekshiriladigan modda eritmasining elektrod potensiali o‘lchanadi. Darajalash chizmasi yordamida aniqlanayotgan ionning konsentratsiyasi topiladi.
Analiz natijasini hisoblash. Aniqlanayotgan ionning namunadagi miqdori (g) quyidagicha hisoblanadi:
bu yerda, Nx - aniqlanayotgan eritmaning darajalash chizmasi yordamida topiladigan normalligi;
Эх - aniqlanayotgan ion ekvivalentining molyar massasi;
Vk- tekshirilayotgan eritmaning hajmi, ml.
Qaydlar uchun _________________________________________________ ___________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________ _______________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________
Hulosa ____________________________________________________________ _______________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________
№2. Laboratoriya ishi
Pоtеntsiоmеtriya. Kuchli yoki kuchsiz kislоtаlаr vа
ishqоrlаr miqdоrini аniqlаsh
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