Răspuns :
Răspuns:
Explicație:
4Na + O2= 2Na2O
Na2O + H2O= 2NaOH
NaOH + HCl= NaCl + H2O
2Na + 2H2O= 2NaOH + H2
3NaOH + AlCl3 =3NaCl + Al(OH)3
2NaOH + CO2=Na2CO3 + H2O
a= Na2O
b=NaOH
c= NaCl
d=H2
e= Al(OH)3
f= Na2CO3
c. soda caustica =hidroxid de natriu
d.obtinerea sodei caustice -----> 2si4
obt. unei baze insolubile ----> 5
e. rosu carmin
f. la obt. sapunului
g. baze
h. Mg(OH)2 KOH Fe(OH)3
II.
Subst.------------------baze
Formula chimica -------------Al(OH)3
Varul---------------in constructii
Denumirea------------------hidroxid de calciu Ca(OH)2
Dupa--------------------------baze solubile si baze insolubile
III.
Cu(OH)2
r.a.= 1:2:2
r.m.= 64 : 32 : 2= 32 : 16 : 1
comp. proc . prin masa moleculara
M= 64 + 32 +2=98-----> 98g/moli
98g Cu(OH)2-------64g Cu -------32gO-------2gH
100g-------------------X------------------Y---------------Z
X= 100. 64 : 98=
Y=100. 32 : 98=
Z=100 .2 : 98=
IV.
ms NaOH=200g , c=20%
HCl , c=36,5%
msHCl
md NaOH= 20.200 :100=40g
40 g xg
NaOH + HCl = NaCl +H2O
40g 36,5g
x= 40. 36,5 : 40=36,5 g HCl
msHCl= 36,5 .100 : 36,5=100 g sol.