Vs₁ = 300 cm³ sol. HNO₃
C₁ = 20%
ρ₁ = 1,119g/cm³
Vs₂ = 700cm³ sol. HNO₃
C₂ = 30%
ρ₂ = 1,184g/cm³
ρ₁ = ms₁/Vs₁ ⇒ ms₁ = ρ₁×Vs₁ = 1,119×300 = 335,7g sol. HNO₃
C₁ = md₁/ms₁×100 ⇒ md₁ = C₁×ms₁/100 = 20×335,7/100 = 67,14g HNO₃
ρ₂ = ms₂/Vs₂ ⇒ ms₂ = ρ₂×Vs₂ = 1,184×700 = 828,8g sol. HNO₃
C₂ = md₂/ms₂×100 ⇒ md₂ = C₂×ms₂/100 = 30×828,8/100 = 248,64g HNO₃
mdf (masa dizolvata finala) = md₁+md₂ = 67,14+248,64 = 315,78g HNO₃
msf (masa solutiei finale) = ms₁+ms₂ = 335,7+828,8 = 1164,5g sol. HNO₃
Cf = mdf/msf×100 = 315,78/1164,5×100 = Calculeaza !!!
Verifica si calculele..
