Răspuns:
solutia 1
c1= md1x100/ms1---> md1= c1xms1/100= 15x200/100g= 30g NaCl
solutia 2
md2= c2xms2/100= 20x300/100g= 60gKCl
solutia 3
ms3=ms1+ms2= 500g
in 5oog sol. se gasesc 30gNaCl si 60gKcl
c,NaCl= 30x100/500=> 6%
c.KCl= 60x100/500= 12%
Explicație: