Rastvori
Submitted by nixahemicar on Mon, 03/20/2017 - 14:53
Forums:
Izracunati zapremine 7,7% rastvora H2SO4, gustine 1,05g/cm3 i 20,1% rastvora iste kiseline, gustine 1,14 g/cm3, potrebne za dobijanje 100cm3 12%-tnog rastvora.
Izracunati zapremine 7,7% rastvora H2SO4, gustine 1,05g/cm3 i 20,1% rastvora iste kiseline, gustine 1,14 g/cm3, potrebne za dobijanje 100cm3 12%-tnog rastvora.
V1*c1+c2*V2=c3*V3
V1*c1+c2*V2=c3*V3
c1=n1/V1=ms1/Mr*V1=w1*mr1/Mr*V1=w1*ro1/Mr=0.077*1.05*1000/98=0.825 mol/l
c2=w2*ro2/Mr=0.201*1.14*1000/98=2.338 mol/l
ro3=ro1+((w3-w1)/(w2-w1))*(ro2-ro1)
ro3=1.05+((0.12-0.077)/(0.201-0.077))*(1.14-1.05)=1.0812 g/cm3
c3=ro3*w3/Mr=1.0812*1000*0.12/98=1.3239 mol/l
V1*0.825+V2*2.338=100*1.3239
V1+V2=V3
V1=V3-V2
0.825*(100-V2)+2.338*V2=100*1.3239
82.5+1.513*V2=132.39
49.89 =1.513*V2
V2=49.89/1.513=32.97 cm3 20.1% kiseline
V1=100-32.97=67.03 cm3 7.7% kiseline