Jizzax politexnika instituti sanoat texnologiyalari fakulteti 60720100

 2-tajriba. Glyukozaning kumush nitrat bilan reaksiyasi. 
Kolbaga kumush nitratning ammiakli eritmasidan 10 ml
quyib, ustidan giyukoza eritmasidan 
qo’shing va chayqatib aralashtiring. So’ngra kolbani suv hammomida qizdiring. Kuzatilgan 
hodisalarni izohlang. Reaksiya tenglamasini yozing. 
 
XULOSA_________________________________________________________________________
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Laboratoriya ishini tajriba qismini topshirish__________ 
Talaba ____________ ___________________________________ 
(imzo)
O‘qituvchi ___________ ___________________________________ 
(imzo)  
 
12-LАBОRАTОRIYA MASHG’ULOTI 
Sana:_______________ 
Mavzu: Di- va polisaxaridlarning xossalarini o’rganish. 
Ishning maqsadi: Di- va polisaxaridlarning xossalarini laboratoriya sharoitida o’rganish 
1-tаjribа. Saxarozaning inversiyasi(gidrolizi) 
Kеrakli rеaktiv va asboblar: 2%li saxaroza eritmasi, 10%li sulfat kislota eritmasi, 10%li 
natriy gidroksid eritmasi. 

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Probirkaga saxarozaning 1%li eritmasidan 4-5 ml quyib, suyultirilgan sulfat kislotadan bir necha 
tomchi tomizing va aralashmani 3-5 minut davomida qaynating .Sovugandan so’g probirkadagi 
aralashma muhiti ishqoriy bo’lguncha 10% li natriy gidroksid eritmasidan va feling suyuqligidan 
qo’shib qizdiring.Eritmaning ranggi o’zgarib, mis (I) oksidining qizil rangdagi cho’kmasining hosil 
bo’lishini kuzating.
XULOSA_________________________________________________________________________
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2- tаjribа. Kraxmalga sifat reaksiya
Kеrakli rеaktiv va asboblar: kraxmal, yodning kaliy yodiddagi eritmasi. 
5 ml suvda 1 gr atrofida kraxmal eriting.Hosil bo’lgan suspenziyani 5 ml qaynoq suv 
solingan stakanga ag’daring.Bunda tiniq kolloid eritma-kraxmal kleysteri hosil bo’ladi.Boshqa 
probirkaga kraxmal kleysteridan 1-2 ml olib, unga 1 tomchi yod eritmasidan tomizilsa, eritma to’q 
ko’k rangga bo’yaladi.Agarda qoqi nonga yoki kartoshkaning kesilgan qismiga 1 tomchi yod 
eritmasi tomizilganda, “ko’karish”ning sodir bo’lishini kuzating.Yod eritmasining “ko’karishi” 
kraxmalga xos sifat reaksiya. 
XULOSA_________________________________________________________________________
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Laboratoriya ishini tajriba qismini topshirish__________ 
Talaba ____________ ___________________________________ 
(imzo)
O‘qituvchi ___________ ___________________________________ 

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13-- LABORATORIYA MASHG’ULOTI 
Sana:__________________________