nazorat ishi Davriy jadvalda nechta oila mavjud A. B. S. 5 D

O’qituvchi Bahosi : ____________

Nazorat ishi- 4

II variant

1. 23 gr Na metalining 300 g suvda erishi natijasida hosil bo’lgan eritmadagi NaOH ning foiz konsentrasiyasini toping.

2. 225 g suvda 50 g mis kuporosi eritilishi natijasida hosil bo’lgan eritmaning konsentrasiyasini (foizda) toping.

3 200 g 15 % li va 500 g 20 % li NaCl eritmalari bir idishga solib aralashtirilishidan hosil bo‘lgan eritmaning foiz konsentratsiyasini (%) hisoblang.

4. Sulfat kislotani 15 % li eritmasini tayyorlash uchun 850 g suvda necha gramm sulfat angidrid eritilishi kerak?

5. KOH ning (ρ = 1,286 g/ml) 30% li eritmasini normalligini toping.

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