Question

va rog am mare nevoie de acesta problema​

Answer 1

c% se exprima prin masa sarii anhidre CaCl2  !!!!!!

c= mdx100/ms---> md= cxms/100= 10x2000/100g= 200g CaCl2

calculez in ce masa de sare cristalizata  se afla 200g CaCl2

MCaCL2..6H2O= 111gCaCl2+ 108gH2O---> 218g/mol

218g sare cristalizata..........111g sare anhidra

x................................................200g

x=392,8g CaCl2.6H2O

c1= 25%

md1= c1xms1/100= 25x500/100g= 125g CaCl2---->-.245,4gCaCl2.6H2O

c2= (245,4+m,sare)x100/(ms+ m sare)

32,34(500+m,sare)= (245,4+m,sare)x100--->  CALCULEAZA m,sare