1-Nazorat ishi

5-amaliy mashg‘ulot.

ERIGAN MODDANING KONSENTRATSIYASI MA’LUM BO‘LGAN ERITMALARINI TAYYORLASH

Osh tuzi eritmasini tayyorlash.

1. Massa ulushi 0,06 bo‘lgan osh tuzining eritmasidan 50 g tayyorlash uchun zarur bo‘lgan osh tuzi va suvning massalari hisoblab topiladi. (Izoh: Laboratoriya imkoniyatlaridan foydalanib, turli moddalarning har xil konsentratsiyalardagi eritmalarini tayyorlash mumkin).

2. Hisoblab topilgan tuz miqdori tarozida, suv esa o‘lchov probirkasi yordamida o‘lchab olinadi (37-rasm). (Izoh: Tarozida tortish qoidalari va suyuqliklarni o‘lchash qoidalarini eslang).

3. Tortib olingan tuzni kolbaga solib, ustiga o‘lchangan suv quyiladi va bir jinsli eritma hosil bo‘lguncha aralashtiriladi.

4. Tayyorlangan eritma idishga quyiladi. Idishga tuzning formulasi, eritmaning konsentratsiyasi va tayyorlangan vaqti yozilgan yorliq yopishtiriladi.

5. Olib borilgan hisoblashlarni kiritgan holda bajarilgan ish yuzasidan hisobot tayyorlanadi.

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