👤

1) Se adauga 20g sare in 300g solutie de sare cu c=15%. Solutia obtinuta are concentratia:
a) 20,31%
b)32,14%
c)37,5%


Răspuns :

C=md/ms*100=>md=C*ms/100=15*300/100=45g sare

md final = 20+45=65g 

ms final = 300+20=320g

C final =mdf/msf*100=65/320*100 = Calculeaza !