Question

calculati masa de apa care trebuie evaporata din 100 g solutie de sare de concentratie 25% pentru a dubla concentratia​

Answer 1

Răspuns:

c1%=5%

ms1=250g

c1=100*md1/ms1,de unde md1=c1*ms1/100=5*250/100=12,5(g)

apa1=ms1-md1=250-12,5=237,5(g apa)

c2%=25%

md2=md1=12,5(g)

c2=100*md2/c2=100*12,5/25=50(g solutie 25%)

m apa2=ms2-md2=50-12,5=37,5(g apa)

m apa=m apa1-m apa2=237,5-37,5=200(g apa)=0,2(kg apa)

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