Question

Oblicz stężenie procentowe roztworu jeżeli do 250g 30-to % roztworu dodamy 50 g wody. Proszę o wypisanie danych

Answer 1

Cp=30%

mr=250g

 

mw=50g

=====

ms=?

mr=?

Cp=?

 

ms=Cp*mr/100%

ms=250g*30%/100%

ms=75g

 

mr=250g+50g

mr=300g

 

Cp=ms*100%/mr

Cp=75g*100%/300g

Cp=25%

Answer 2

mr=250g

Cp=30%

ms=Cp*mr/100%

ms=30*250/100

ms = 75g

Po dodaniu 50g wody

ms=75g

mr=300g

Cp=ms*100%/mr

Cp=75*100/300

Cp = 25%