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3 – Amaliy mashg`ulot.
Mavzu: Ifloslangan osh tuzini tozalash.
Darsning maqsadi: Suvda eruvchan qattiq moddani suvda erimaydigan qo`shimchalardan tozalash usulidan biri bilan tanishish. Filtr qog`oz tayyorlash suyuqliklarni filtrlash va eritmani bug`latish yo`li bilab tuz ajiratib olishga oid malaka hosil qilish.
Kerakli asboblar va reaktivlar: tozalanmagan osh tuzi 100 g distrlangan suv 100 ml, probirkalar, chinni kosacha, shisha tayoqcha, voronka, filtr qog`ozi, qaychi, quruq yonilg`i, temir shtativ.
Ishning borishi: 20 ml distillangan suvga shisha tayoqcha bilan aralashtirib turgan holda 3 qoshiq ifloslangan osh tuzini oz-ozdan qo‘shiladi. Тuz erimay qolgandan so‘ng tuz qo‘shish to‘xtatiladi. Eritmaning tashqi ko‘rinishi ko‘zdan kechiriladi. Filtrni voronkaga joylab, osh tuzining loyqa eritmasini filtr devoriga tegizilgan shisha tayoqcha yordamida asta-sekin filtrga quyiladi. Filtrdan o‘tgan tiniq eritmani filtrat deyiladi. Filtratni chinni kosachaga quyib, shtativ xalqasiga o‘rnatiladi. Shtativ tagligiga qo‘yilgan spirt lampa yoki gaz gorelkasi alangasi chinni kosacha tagiga tegadigan qilib yoqiladi va qizdirish olib boriladi. Eritma sachramasligi uchun shisha tayoqcha bilan aralashtirib turiladi. Chinni kosacha tagida tuz kristallari hosil bo‘la boshlashi bilan qizdirishni to‘xtatiladi. Olingan tuzning tashqi ko‘rinishi ko‘zdan kechiriladi.
Xulosa.
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Sana ______________20__yil
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