Răspuns:
Explicație:
ms1=300g
c1=15%
ms2=250g
c2=25%
c finala
-se afla md1 si md2 de la cele doua sol.
md1=c1.ms1 :100
md1=15.300:100=45g NaCl
md2=c2.ms2 :100
md2=25 . 250 :100=62,5g sare
-se afla ms total
msf=300g + 250g=550g
-se afla md total
mdf=45g + 62,5g=107,5g
-se afla cf
cf= mdf . 100 : msf
cf=107,5 .100 : 550=19,54 %
