masti

Submitted by banj00 on Thu, 06/19/2014 - 16:55
banj00's picture
Forums: 
Opšta diskusija

Koliko se miligrama slobodne stearinske kiseline nalazi u 10g neke masti ako je za neutralizaciju te kolicine masti utroseno 50cm3 natrijum hidroksida koncentracije 0,1mol/dm3 resenje 1420

milicaradenkovic's picture

milicaradenkovic - Thu, 06/19/2014 - 17:10

Resen je zadatak ali cu ga ja resiti ponovo

3CH3(CH2)16COOH+CH2OHCHOHCH2OH------------------>CH2OOC(CH2)16CH3CHOOC(CH2)16CH3CH2OOC(CH2)16CH3

CH2OOC(CH2)16CH3CHOOC(CH2)16CH3CH2OOC(CH2)16CH3+3NaOH------------------->3CH3(CH2)16COONa+CH2OHCHOHCH2OH

n(NaOH)=c*V=0.05*0.1=0.005 mol

n(glicerida)=n(NaOH)/3=0.005/3=0.00167 mol

n(stearinske kiseline)=3*n(glicerida)=0.00167*3=0.005 mol

m(stearinske kiseline)=n(stearinske kiseline)*Mr=284*0.005=1.42 g=1420 mg

Simalux's picture

Simalux - Mon, 08/30/2021 - 21:44

Može li ovo nekako skraćeno da napiše?