|
=16,2
= 140
= 2,92
-?
| :
=  +  
 =
=20 / (/)
|
=12 / (/).
1000
= 
=7,53 /.
: = 7,53 /.
2. 200 , , , 9 /.
| :
n (Ca+2) = n (CaSO4)
= 
|
-?
= 68 / (/)
=122,4
: 
3. 10 . (Na2B4O7), , 5 /.
|
= 10
= 5 /
| :
MgSO4 + Na2B4O7 = MgB4O7↓ + Na2SO4
n(MgSO4) = n(Na2B4O7)
= 
|
M(Na2B4O7) = 
/
= 
=
= 5,05
: 
= 5,05
1. 100 3 , , 12 3 0,15 HCl. . , 40 .
| :
:
Mg(HCO3)2 + 2HCl = MgCl2 +
+ 2H2O + 2CO2↑
=  =
=  .
|
= 12 3
= 40
(HCl) = 0,15 /
?
-?
nMg(HCO3)2 = n(HCl) = C(HCl)·V 
= 
= 18 /.
40 :
= 
,
= 
=
= 
=52,56 .
[Mg(HCO3)2] = 
=73 / (/);
: = 18 /, = 52,56 .
2. 2 ( >10,3), , 28 . . 0,5 3 .
|
= 28 = 0,028 .
| : , , , : |
a(H3)2 = CaCO3↓ + H2O + CO2↑
Mg(HCO3)2 = Mg(OH)2↓ + 2CO2↑ ( >10,3)
Fe(HCO3)2 = Fe(OH)2↓ + 2CO2
: n(Mg(HCO3)2) = n(Mg(OH)2), .
= 
= 
= 0,48 /
[Mg(OH)2] = 
29 / (/)
0,5 3 .
= 
= 
[Mg(O3)2] = 
73 / (/)
= 
= 17,52 .
: = 0,48 /, = 17,52 .
3. 10 , 0,015% 0,005% , . 1 /3. . , .
|
|
|
| : Ca(OH)2 ( ) . : |
=0,015%
=0,005%
= 1 /3
-?
Ca(HCO3)2 + Ca(OH)2 = 2CaCO3↓ + 2H2O
Mg(HCO3)2 + 2Ca(OH)2 = Mg(OH)2↓ + 2CaCO3↓ + 2H2O
∙100
∙100
∙10-2 ∙m = 
= 0,015·10-2 10·103·1 = 1,5 .
∙10-2 ∙m = 
= 0,005·10-2·10·103·1 = 0,5 .
= 
=
= 
2,53 /.
[a(O3)2] = 
81 / (/)
[Mg(O3)2] = 
73 / (/)
, :
Ca(HCO3)2 + Ca(OH)2 = 2CaCO3↓ + 2H2O
162 74 
1,5
Mg(HCO3)2 + 2Ca(OH)2 = Mg(OH)2↓ + 2CaCO3↓ + 2H2O
146 274 
0,5
0,685 + 0,507 = 1,192 .
: 1,192 .
