Question

Oblicz stężenie procentowe (cp) roztworu otrzymanego po zmieszaniu 200g roztworu 8% i 100g roztworu 30%.

PILNE!

Answer 1

mr₁=200g

Cp₁=8%

ms₁=?

Cp=(ms*100%)/mr /*mr

Cp*mr=ms*100% /:100%

ms=(Cp*mr)/100%

ms=(8%*200g)/100%=16g

ms₁=16g

 

mr₂=100g

Cp₂=30%

ms₂=?

Cp=(ms*100%)/mr /*mr

Cp*mr=ms*100% /:100%

ms=(Cp*mr)/100%

ms=(30%*100g)/100%=30g

ms₂=30g

 

ms₃=16g+30g=46g

mr₃=200g+100g=300g

Cp₃=(46g*100%)/300g=15,3%

Cp₃=15,3%

 

Answer 2

mr1=200g   Cp1=8%     mr2=100g     Cp2=30%    Cp3=?

 

mr----100%

ms----Cp

 

 

ms1=mr1*Cp1/100%

ms1=16g

 

 

ms2=mr2*Cp2/100%

ms2=30g

 

ms3=ms1+ms2

ms3=46g

 

mr3=mr1+mr2

mr3=300g

 

Cp3=ms3*100%/mr3

Cp3=15,3%