1. Eruvchanlik haqida tushuncha. Foiz, molyar,normal va ekvivalent konsentrasiya

2-misol. 500 g  10  li CaCl2  eritmasini tayyorlash  uchun necha gramm kristallgidrat CaCl2· I6H2O qancha suv olish  kerak?

Yechish. a) 500 g 10 li eritma  tayyorlash  uchun necha gramm CaCl2 kerakligini   hisoblaymiz.          100 g  eritmada  10 g CaCl2 bor.     500 g                  x g x   50 g b) 1 mol  CaCl2 111g, CaCl26H2O  219 g bo`lgani  uchun 50 g CaCl2 necha gramm CaCl26H2O  tarkibida bo`lishini aniqlaymiz.   219 g CaCI26H2O tarkibida   111 g  CaCI2 bor                x g                           50 g Demak, 98,65g  CaCI26H2O  va  500-98,65 = 401,35 g suv olish kerak