Răspuns:
Explicație:
50g sol. HCl
c=3,65%
masa Na2 CO3
- se afla md de HCl
md=c.ms : 100
md=3,65 .50 : 100=1,875 g HCl
xg 1,875g
Na2CO3 + 2HCl = 2NaCl + CO2 + H2O
106 g 2.36,5g
x=106 . 1,875 :73=2,72 g Na2CO3
MNa2CO3= 2.23 + 12 + 3.16=106--------> 106 g/moli
MHCl=1+ 35,5=36,5------->36,5g/moli