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la 200 g solutie de NaOH de concentratie 30% se adauga 100 g solutie apoasa ..C% =?

Răspuns :

Sudoku95
ms1=200 g;c1=30%,m apa =100g;c2=?
c1=(md1/ms1)*100=>md1=(ms1 * c1)/100=(200*30)/100=60 g NaOH
ms2=m apa+ms1 = 100+200=300g
c2=(md2/ms2)*100=(60/300)*100=>c2=20%

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