Question

Rezolvatimi va rog problema aceasta:
ms=200 (g) sol Hcl
c=10%
+
Ca=(OH)2

a) m=? (g) Ca (OH)

b) c sare=?

Answer 1

c=md*100/ms => md=c*ms/100=10*200/100=20g HCl
20g.........x=?.............y=?.......z=?
2HCl + Ca(OH)2 -> CaCl2 + 2H2O
73g.........74g............111g......36g
x=20*74/73=20,27g Ca(OH)2
acum, in solutia initiala aveam HCl si apa => ms=md+mH2O => mH2O=ms-md=180g apa
y=20*111/73=30,4g CaCl2
z=20*36/73=9,86g apa reactie
mtotalapa=180+9,86=189,6g
msfinal=msare+mtotalapa=30,4+189,6=220g
csare=msare*100/msfinal=30,4*100/220=13,81%