Question

do 50 g 2-procetowego roztworu zasady sodowej dolano 50 g wody. oblicz stezenie procentowe rozcienczonego roztworu . pilne

Answer 1

Cp=ms/mr x 100%

0,02=ms/50

ms=1g

 

Cp=1/(50+50)x 100%

C=1%

Answer 2

mr₁=50g

Cp₁=2%

ms₁=?

 

Cp=ms/mr * 100%    /*mr

Cp*mr=ms*100%    /:100%

ms=Cp*mr/100%

 

ms₁=2%*50g/100%

ms₁=1g

 

ms₂=ms₁=1g

mr₂=mr₁+50g=100g

Cp₂=?

 

Cp=ms/mr * 100%

Cp=1g/100g * 100%

Cp=1%