Question

se supun saponificarii 8,90 g tristerina cu solutie de KOH de concentratie 40%
a) Calculeaza masa de sapun obtinuta,stiind ca toata cantitatea a reactionat
b)Hidroxidul de potasiu s-a introdus in exces de 10%.Calculeaza masa de solutie de hidroxid de potasiu introdus in procesul de saponificare.

Answer 1

890g..............3*56g.......3*322g
Tristearina + 3KOH -> 3CH3-(CH2)16-COOK + glicerina
8,9g.................y=?.........x=?
x=8,9*966/890=9,66g sapun
y=8,9*3*56/890=1,68g KOH
1,68g...............100%
z......................110%
z=1,68*110/100=1,848g KOH
40/100=1,848/ms => ms=1,848*100/40=4,62g solutie KOH