Question

Se amesteca 100g solutie 10% NaCH cu 100g solutie 50% NaCH.
Sa se afle concentratia procentuala a solutiei obtinute?


Multumesc.​

Answer 1

Răspuns:

c= (md/ms)*100

=> md= c*ms/100

md(1)= 10*100/100= 10 g

md(2)=50*100/100=50 g

ms final= ms(1)+ms(2)

ms final= 100+100

ms final= 200

md final= md(1)+md(2)= 10+50= 60 g

c= (md final/ ms final)*100= 60*100/200=30% ( media aritmetica a conc. celor 2 solutii)