rastvori
Submitted by tinC on Sun, 03/09/2014 - 18:20
Forums:
mz help?
Koliko je grama 12%-og rasvora KOH i 6%-og rastvora KOH potrebno za pripremanje 200g 10%-og rastvora?
mz help?
Koliko je grama 12%-og rasvora KOH i 6%-og rastvora KOH potrebno za pripremanje 200g 10%-og rastvora?
mr=200 g w=10%
mr=200 g w=10%
mr1+mr2=mr
200=mr1+mr2
ms=ms1+ms2
ms=w*mr=200*0.1=20 g
20=mr1*w1+mr2*w2
20=0.12*mr1+0.06*mr2
mr2=200-mr1
20=0.12*mr1+0.06*(200-mr1)
20-12=0.06*mr1
mr1=8/0.06=133.33 g 12 % rastvora KOH
mr2=200-133.33=66.67 g 6 % rastvora KOH
hvala jos jednom.. :)
hvala jos jednom.. :)