Andijon viloyati andijon tumani umumta`lim maktabining 7 – “ ” sinf

8 nazorat ishi
Mavzu: Oksid ,asos, kislota, tuzlar mavzularini umulashtirish
Nazorat shakli: Tajribaviy masalalar yechish
Tajriba : Neytrallanish reaksiyasi.
Chinni kosachga 3ml natriy gidroksid eritmasidan quying, ustiga fenolftaleindan 1-2 tomchi tomizing va eritmaning rangiga etibor bering, eritmaning rangi yoqolguncha ustiga tomchilab xlorid kislota eritmasidan quying hamda shisha tayoqcha yordamida doimo aralashtirib turing.Hosil bo’lgan eritmaning spirt lampasi yordamida qizdirib va suv bug’lanib bo’lgach, tuzni ko’zdan kechiring. Reaksiya tenglamasi va tajriba hulosalarini yozing.
Kompitentlikni aniqlash uchun materiallar:
Tajriba: Chuqurroq farfor (kimyoviy chinni kosacha) idishga (suv quvuridan keladigan suv) vodopravod suvidan solib, spirt lampasi yoki quruq spirtning kattaroq bo’lagida suv qolmaguncha qizdiriladi. Qizdirish tugatilganda idish tagida mayda (kulrang-oq rangdagi) kristallar hosil bo’ladi. O’tkazilgan tajribadan kundalik turmushda foydalaniladigan (suv quvuridan keladigan suv) vodoprovod suvi haqida qanday xulosa qilsa bo’ladi? Vodoprovod suvini qaynatmasdan ichish mumkinmi?
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Sana Ball Imzo