Question

Ce cantitati de solutii de NaOH de concentratiile 10% si 40% (C1=10% si C2=40%) sunt necesare pentru a prepara 800 grame solutie NaOH de concentratie 20%?

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Answer 1

C₁ = 10%...................ms₁ = 20 parti masice sol. C₁ = 10%
               Cf = 20%
C₂ = 40%...................ms₂ = 10 parti masice sol. C₂ = 40%
⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻
                                   total = 30 parti masice (ms₁+ms₂)

30 parti masice........20 parti masice (C₁=10%).........10 par. mas.(C₂=40%)
800g sol..................ms₁..............................................ms₂

ms₁ = 20×800/30 = 533,33g sol. C₁ = 10%
ms₂ = 10×800/30 = 266,66g sol. C₂ = 40%