Răspuns:
Explicație:
80g xg y
NaOH + HCl = NaCl + H2O
40g 58,5 g 18g
x=80.58,5 :40=117 g NaCl [ md sol. ]
n=nr. moli
n= 117g : 58,5 g/moli=2 moli NaCl
y=80 . 18 : 40=36 g H2O
c= md.100 : ms
c= 117.100 : ( 117 + 36 )=76,47 %
MNaOH=23+16+1=40------->40g/moli
MNaCl=23 + 35,5=58,5------> 58,5 g/moli