Laboratoriya ishi Ikki va uch valentli temir tuzlarini bilib olish
1. Probirkaga yangi tayyorlangan FeSO 4 eritmasidan 3—5 tomchi quying va uning ustiga qizil qon tuzi K3[Fe(CN)6] eritmasidan bir necha tomchi qo‘shing.Òurunbul zangori cho‘kmasi Fe3[Fe(CN) 6]2 hosil bo‘lishini kuzating. Reaksiya tenglamasini yozing. Bu reaksiya eritmada Fe2+ ioni borligini bilib olish uchun sifat reaksiya hisoblanadi.
2. a) probirkaga temir (III)-xlorid eritmasidan 2—3 tomchi quying va ustiga sariq qon tuzi K4[Fe(CN)6] eritmasidan bir tomchi tomizing. Berlin lazuri cho‘kmasi Fe4[Fe(CN)6]3 hosil bo‘lishini kuzating. Reaksiya tenglamasini molekular va ionli ko‘rinishda yozing;
b) probirkaga FeCl3 eritmasidan 5—6 tomchi 0,01 Mkaliy yoki ammoniy rodanid eritmasidan tomizing.Eritma temir (III)-rodanid Fe(SCN)3 hosil bo‘lganligi tufayli to‘q qizil tusga bo‘yaladi. Reaksiya tenglamasini molekular va ionli ko‘rinishda yozing.
3. a) va b) reaksiyalar Fe3+ ioni uchun sifat reaksiyasi hisoblanadi.
Mustaqil xulosa uchun topshiriq 1. Sodir bo‘lgan hodisalarni izohlang.
2. Tegishli reaksiya tenglamalarini yozing. Chinni kosachaga 3 g yog', margarin yoki saryog' soling va 20 % li natriy gidroksid eritmasidan 7-8 ml quying.
Reaksiyani tezlatish uchun 1-2 ml etanol qo'shing. Aralashmani shisha tayoqcha bilan aralashtirib, dastlabki hajmi kamayib ketmasligi uchun suv qo'shib turgan holda, 15-20 minut qaynating. Reaksiyaga kirishmagan yog' qolmaganini bilish uchun issiq aralashmadan ozginasini issiq suvli probirkaga oling. Agar sovundan so'ng suv ostida yog' tomchilari paydo bo'lmasa sovunlash jarayoni nihoyasiga yetgan bo'ladi.
Agar yog' tomchilari yuzaga chiqsa, aralashmani qaynatishni davom ettiring. Sovunlash reaksiyasi tugaganidan so'ng hosil bo'lgan massaga 0,5 g natriy xlorid qo'shing va yana 1-2 minut qaynating.
Mustaqil xulosa uchun topshiriq O'tkazilgan tajriba natijasida suv betiga qanday modda chiqdi?
Sodir bo'lgan reaksiya tenglamasini yozing.
Yog'lardan sovunlash jarayonida qanday amaliy maqsadlarda foydalaniladi?_____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________ _____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________ __________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________
