MarianakaDemianask
a fost răspuns

se amestecă doua solutii. O solutie are masa 200g si concentratia procentuala 20%, cea de-a doua solutie conține 10g de sare si are concentratia 10%. Aflati concentratia solutiei finale​

Răspuns :

MihaiKappaask

ms1=200g

c1=20%

c1/100 = md1/ms1 => md1/ = c1ms1/100 = 20x200/100 => md1=40g

ms = md + apa si in ms2 sunt 10g sare => md2= 10g

c2/100 = md2/ms2=> ms2 = 100md/c2 = 100x10/10 = 100g solutie

mf = ms1+ ms2= 200g+100g= 300 g ms2

mdf = md1 + md2 = 10g + 40 g = 50g md2

cf/100 = mdf/msf

=> c= 100mdf/msf = 100x50/300 =50/3 = 16,66%

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