ms=masa solutiei
md=masa dizolvata in solutie
c=concentratia procentuala a solutiei
a) m H2O=0,56 kg H2O=560
md=40 g KOH
ms=md+m H2O
ms=40+560
ms=600 g solutie
Aplicam formula:
[tex]c= \dfrac{md*100}{ms} [/tex]
[tex]c= \dfrac{40*100}{600}=6,67 \ \%[/tex]
b) 0,4 l H2O=0,4 dm³ H2O
m H2O=0,4*1000=400 g
[tex]M_{H2SO4}=2*1+32+4*16=98[/tex]
md=98 g H2SO4
ms=md+m H2O
ms=98+400
ms=498 g solutie
[tex]c= \dfrac{98*100}{498}=19,68 \ \% [/tex]
Sper ca te-am ajutat :)
