Am 1 L solutie cu concentratia de 40%. Cata solutie cu concentratia de 70% trebuie sa adaug ca sa obtin concentratia de 50%.
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c3= md3x100/ms3
ms1=1000g(consider ro=1g/ml)
c1= 40%-------------------------------> md1= c1xms1/100= 0,4x1000= 400g
ms2=?
c2= 70%-------------------------------> md2= 0,7xms2
c3=md3x100/ms3, md3=md1+md2
ms3=ms1+ms2
50/100= (4oo+0,7ms2)/ (1000+ms2)
100(400+0,7ms2)= 50(1000+ms2)--------------------> calculeaza ms2!!
ms1=1000g(consider ro=1g/ml)
c1= 40%-------------------------------> md1= c1xms1/100= 0,4x1000= 400g
ms2=?
c2= 70%-------------------------------> md2= 0,7xms2
c3=md3x100/ms3, md3=md1+md2
ms3=ms1+ms2
50/100= (4oo+0,7ms2)/ (1000+ms2)
100(400+0,7ms2)= 50(1000+ms2)--------------------> calculeaza ms2!!
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40000+70*ms2=50000+50*ms2
70*ms2=50000+50*ms2-40000
70*ms2-50*ms2=50000-40000
70*ms2-50*ms2=10000
20*ms2=10000
ms2=10000/20
ms2=500
Deci in solutia cu concentratia de 40% adaugam 500g (.0,5L) din solutia cu concentratia de 70% si obtinem 1,5L de solutie cu concentratia de 50%.