|
: = + = =20 / (/) |
=12 / (/).
1000
= =7,53 /.
: = 7,53 /.
2. 200 , , , 9 /.
| : n (Ca+2) = n (CaSO4) = |
= 68 / (/)
=122,4
:
3. 10 . (Na2B4O7), , 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↑ = = = . |
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 .
|
: , , , : |
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 ( ) . : |
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 .