Rozwiązane

Do 20 g 25 %roztworu KOH o gęstosci 1,08 g/cm^3 dodano 10 cm^3 roztworu o stezeniu 5 % (d=1,05 g/cm^3). oblicz stezenie procentowe i gestosc



Odpowiedź :

Dane:

mr1=20 g

Cp1=25%

dr1=1,08 g/cm3

dr2=1,05 g/cm3

Cp2=5%

Vr2=10 cm3

mr3=20 g+1,05 g/cm3*10cm3=30,5 g

Szukane:

ms1=?

ms1=Cp1*mr1/100%

Vr1=mr1/dr1

ms2=?

ms2=Cp2*dr2*Vr2/100%

ms3=?

ms3=ms1+ms2

Vr3=?

Vr3=Vr1+Vr2

dr3=mr3/Vr3

Cp3=?

Cp3=ms3*100%/mr3

Obliczenia:

ms1=25%*20g/100%

ms1=5 g

Vr1=20g/1,08 g/cm3

Vr1=18,52 cm3

ms2=5%*1,05 g/cm3*10cm3/100%

ms2=0,525 g

ms3=5g+0,525 g

ms3=5,525 g

Vr3=18,52 cm3+10 cm3

Vr3=28,52 cm3

dr3=30,5 g/28,52 cm3

dr3=1,07 g/cm3

Cp3=5,525g*100%/30,5 g

Cp3=18,11%