Question

Se amesteca 200 grame solutie 20%sare cu 200 de grame solutie 10% sare si 200 grame apa. Ce concentrate procentuala va avea solutia obtinuta?

Answer 1

c=mdx100/ms----> md=cxms/100

ms1=200g
c1=20%
ms2=200g
c2=10%
m,apa=200g
c3=md3x100/ms3

ms3= ms1+ms2+m,apa= 600g
md3=md1+md2
        =c1xms1/100+c2xms2/1oo
       =0,2x200+0,1x200=> 30g
c3= 30x100/ 600=.........................calculeaza !!