Question

do 80 gram, 15% roztworu kwasu H2 CO4 dodano 20 gram wody. Oblicz CP (stężenie procentowe) ;D

Answer 1

mr=80g

Cp=15%

mH2O=20g

ms=(cp* mr)/100

ms=15*80/100

ms=12g

 

cp2=(12g*100%)/100g

cp=12%

Answer 2

Dane:

mr= 80g

Cp1= 15%

 

Szukane:

Cp2=?

ms=?

mr2=?

 

15%= 0,15

ms= 80g * 0,15  = 12g

mH20= 80g - 12g = 68g

mH20 2 = 68g + 20g = 88g

mr2 = 88g + 12g = 100

 

Cp = ms/mr * 100%

Cp2= 12g/100g * 100% = 12%