acolo apare NaOH adica hidroxid de sodiu sau soda caustica
ms1=200g NaOH
c1=20%
ms2=50g NaOH
c2=5%
md final= md1+md2
ms final = ms1+ms2
c finala= md final/ms final ori 100
md1=200 ori 20/100 =40g
md2 =50 ori 5/100= 2,5g
md final= 42,5
ms final=250
deci c final= 42,5/250 ori 100 = 17%