Question

In 500 g apa de dizolva 50 g piatra vanata. Ce concentractie procentuala va avea solutia astfel obtinuta?

Answer 1

ms=500g

md=50g

c= md/ms×100

c=50g/500×100

c=0,01×100

c=1%

Answer 2

m apa=500 g apa
md=50 g piatra vanata
c=?
ms=?
regula de trei simpla :
50g sol..............500g subs
100 g sub............ms
ms=100×500 / 50
ms=50 g sol
c=md / ms ×100
c=50/50×100
c=250 % substanta "/"=supra

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