Răspuns:
Explicație:
2. c
[2NaOH + CO2=Na2CO3 + H2O]
[2NaOH + CaCl2 = 2NaCl + Ca(OH)2]
2NaOH + BaCl2= Ba(OH)2 +2 NaCl ( c )
B. c
md= 30g NaOH
mapa= 120g
c
c= md .100 : ms
ms= md + mapa
ms= 30 + 120= 150 g
c= 30.100 : 150= 20 %
C. b
+ 2-
Na2SO4------> 2Na + SO4 3 ioni
