Question

Volumul de solutie de acid sulfuric de concentratie 90%,(densitate=1,814g/cm cub)Ce trebuie adaugata peste 2 kg solutie de acid sulfuric de concentratie 30% pt a obtine o solutie de 50% :
A)0,506 cm3
B)2,621 L
C)0,551L
D)0,469cm3
E)0224L

Answer 1

solutia 1 :  ms1       c1 = 90% ⇒ md1 = 0,9ms1
solutia 2 : ms2 = 2000g   c2 = 30% ⇒ md2 = 600g 
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ms final = 2000+ms1    md final = 600 + 0,9ms1     c = 50%
(600+0,9ms1)·100/(2000+ms1) = 50
1200+ 1,8ms1 = 2000 +ms1       0,8ms1 = 800     ms1 = 1000g
Vs1 = ms1/q = 1000/1,814 = 551,267cm³ = 0,551 l