Question

Se da urmatoarea schema te reactii în care se cunosc substanțele: c-vitriol, d-soda caustică.
1) a+b=c
2) c+d=e+b
3) c+f=e+b
4) c+g=e+b+CO2
5) Cu+c=h +i +b
6)c+j=i+b
7)c+NaNo3=e+l
8)l+Zn =m+n
9)j+n=o
10)c+p=BaSO4+r
Se cere a). scrierea ecuatiilor si determinarea substantelor necunoscute.
b). Tipul reacției chimice.
c). Importanta practica a reactiilor 1,4,8,10.

VA ROG .REPEDE
REZOLVARE CONPLETA.

Answer 1

a+b=c        SO3+ H2O=H2SO4                                     a=SO3
                                                                                       b= H2O
c+d=e+b     H2SO4 +2NaOH =Na2SO4 +2H2O           c=H2SO4
                                                                                       d=NaOH
                                                                                       e=Na2SO4
c+f=e+b       H2SO4 +Na2O =Na2SO4 +H2O               f =Na2O

c+ g=e+b+CO2    H2SO4 +Na2CO3 =Na2SO4 +H2O+CO2          g=Na2CO3

Cu+c =h+i+b       Cu+2H2SO4=CuSO4 +SO2 +2H2O                   h=CuSO4
                                                                                                         i=SO2
c+j=i+b              2  H2SO4 +C=CO2+2SO2 +2H2O                       j=C

c+NaNO3=e+f       H2SO4 +2NaNO3=Na2S04 +2HNO3              I=HNO3

I +Zn=m+n            2HNO3 +Zn =Zn(NO3)2 +H2                          m=ZnNO3)2
                                                                                                       n=H2

j+n=o                      C+2H2=CH4                                                  o=CH4

c+p=BaSO4 +r       H2SO4 +BaCl2=BaSO4 +2HCl                    p=BaCl2
                                                                                                     r=HCl

2.
Reactia 1-obt. H2SO4
4
Obt. CO2 sau react. de recunoastere a carbonatilor

8.
Obt. H2
 10.
React. de recunoastere a H2SO4