[tex]md = \frac{c \times ms}{100} [/tex]
[tex]md = \frac{400 \times 10}{100} [/tex]
md=4×10
md=40
[tex]cf = \frac{md1 + md2}{ms + md2} \times 100[/tex]
[tex]cf = \frac{40 + 20}{400 + 20} \times 100[/tex]
[tex]cf = \frac{60}{420} \times 100[/tex]
cf=14,28 %
Răspuns:
Explicație:
ms1=400g
c1=10%
c1= md1x100/ms1----> md1= 10x400/100g= 40gNaCl
m=20g se adauga atat mase solutiei cat si masei dizolvatului
ms2= ms1+m,adaugat=420g
md2= md1+m,adaugat= 60g
c2=60x100/420=......................calculeaza
