Răspuns:
se aplica relatia
c= mdx100/ms, unde ms= md+m,apa
ms=300g
c=25%
v,apa ?
md= cxms/100=25x300/100g=75gNaCL
m,apa= ms-md= 300-75-> 225g
cum ro,apa-= 1g/ml, v,apa= 225ml
v,s= 200ml
ro=1,072g/l
c=15%
md?
ms= roxv,s= 1,072x200=>214,4 g
md=15x214,4/100g=32,16gHCl
Explicație:
