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care va fi concentratia solutiei obtinuta prin amestecul a 20 grame solutie 10% cu 40 g concentratie 20%?

Răspuns :

C1=md1/ms1*100=>md1=C1*ms1/100=10*20/100=2g

C2=md2/ms2*100=>md2=20*40/100=8g

md final = md1+md2=2+8=10g

ms final = ms1+ms2=20+40=60g

C final = mdf/msf*100=10/60*100 =