Question

zmieszano : 200g 10% roztworu i 300g 20% roztworu. Oblicz stężenie procentowe otrzymanego roztworu

Answer 1

Cp₁=10%

mr₁=200g

Cp₂=20%

mr₂=300g

Cp₃=?

 

Cp=ms/mr * 100%         /*mr

Cp*mr=ms*100%          /:100%

ms=Cp*mr/100%

 

ms₁=200g*10%/100%

ms₁=20g

 

ms₂=300g*20%/100%

ms₂=60g

 

ms₃=ms₁+ms₂=80g

mr₃=mr₁+mr₂=500g

 

Cp₃=ms₃/mr₃ * 100%

Cp₃=80g/500g * 100%

Cp₃=16%