ms1=400g HCl
C1=10%
+
ms2=400g HCl
C2=5%
+
mH2O=200g
stim ca c% = mdx100/ms => md = msxc%/100
=> md1 = ms1xc1/100 = 400x10/100 = 40 g
md2 = ms2xc2/100 = 400x5/100 = 20 g
md.tot = md1+md2 = 40+20 = 60 g
ms.tot = ms1+ms2+m.apa = 400+400+200 = 1000 g
=> c%.final = md.totx100/ms.tot
= 60x100/1000 = 6%