Question

Oblicz ile wynosi stęzenie % jeżeli do 40g roztworu dodano 32g cukru a roztwór jest 10 procentowy

Answer 1

m roztworu₁ = 40g

Cp₁ = 10%

m substancji₁ = (mr * Cp%) / 100% = (40g * 10%) / 100% = 400g/100 = 4g

 

m roztworu₂ = 40g + 32g = 72g

Cp₂ = ?

m subst₂ = 4g + 32 g = 36g

 

Cp = (ms * 100%) / mr = (36g * 100%) / 72g = 3600% / 72 = 50%

Answer 2

Cp=10%

mr=40g

ms=Cp*mr/100%

ms=10*40/100

ms=4g cukru

 

Po dodaniu 32g cukru

ms=36g

mr=72g

Cp=ms*100%/mr

Cp=36*100/72

Cp=50%