1. .
95%- (r =1,84 /) 400 10%- ?
, . .
, 1, 2.
: :
% 1=95% r1 =1,84 /
m 2 -=400 ( ):
C% 2=10% (1)
: V 1=? (m 1) : m 1- = V 1 ρ 1,
(2)
m 1= m 2, (1) (2).
: 95%- 22,9 .
2. .
25%- 75 15%- ?
, , 1, 2.
: :
C% 1= 15% :
m 1 -=75 H3COOH + KOH = CH3 COOK + H2O
C% 2= 25% ,
:
: m 2-=?
( ), :
.
, :
, :
: 42 , .
3.
450 50 CuSO4×5H2O. (CuSO4×5H2O) (CuSO4) .
1, 2.
: :
=450 :
m 1 = 50 m - = m 1- = m 2- = + m 1.
: m - = 450 + 50 = 500 .
% 1, % 2 =?
:
:
:
: 10% , 6,39% .
4. , .
36,2% - ( ) , 1,18 /.
: :
% = 36,2 %
r = 1,18/
|
|
( ):
: =?
(m) , , , m- = V ρ, :
. (2)
/ r =1,18103/, , :
. (3)
, (3) :
: 11,7/.
5. , .
1,68 H2SO4, 1,1 /.
: :
= 1,68 / , .3.2
r = 1,1/
( ,
: % =? 4):
: 15 %.
6:
1. , ( 7).
2. .
1. | 2. |
1. NaNO2, Cu(NO3)2 | 1. Fe2(SO4)3 + Na2CO3 |
2. AlCl3, NaHCO3 | 2. Na2S + Al2(SO4)3 |
3. Na3PO4, ZnCl2 | 3. SnCl2 + K2SO3 |
4. FeCl2, K2S | 4. Cr2(SO4)3 + K2S |
5. K2SO3, ZnSO4 | 5. K2CO3 + Bi(NO3)3 |
6. NH4Cl, KClO | 6. Na2S + AlCl3 |
7. Na2Se, MnCl2 | 7. FeCl3 + K2CO3 |
8. ZnSO4, BaS | 8. Cr2(SO4)3 + Na2SO3 |
9. Ni(NO3)2, KNO2 | 9. K2SO3 + AlBr3 |
10. NH4Br, Na2S | 10. Bi(NO3)3 + Na2CO3 |
11. Na2HPO4, Mg(NO3)2 | 11. CrCl3 + K2S |
12. Al2(SO4)3, Na2SeO3 | 12. Na2CO3 + Cr(NO3)3 |
13. CuSO4, K3PO4 | 13. K2SiO3 + Bi(NO3)3 |
14. Na2SO3, Fe2(SO4)3 | 14. Na2SO3 + CrCl3 |
15. NaCN, FeSO4 | 15. Be(NO3)2 + Na2SO3 |
16. Ba(CH3COO)2, CoSO4 | 16. AlCl3 + Na2SO3 |
17. NiSO4, NaF | 17. SnCl2 + Na2CO3 |
18. Pb(NO3)2, Ba(NO3)2 | 18. Na2S + Al2(SO4)3 |
19. Cr2(SO4)3, NaCH3COO | 19. Fe(NO3)3 + K2CO3 |
20. KHS, MgSO4 | 20. Al2(SO4)3 + Na2CO3 |
21. CdCl2, NaClO | 21. Na2SO3 + SnCl2 |
22. Cr(NO3)3, K2CO3 | 22. NH4Cl + Na2SiO3 |
23. KHSO3, MnSO4 | 23. K2SO3 + CrCl3 |
24. Li2S, CrCl3 | 24. AlBr3 + Na2SO3 |
25. SrS, SnBr2 | 25. BeCl2 + Na2S |
26. Ca(HCO3)2, CuBr2 | 26. BeCl2 + Na2SO3 |
27. Li2SO3, AlCl3 | 27. Fe2(SO4)3 + K2SO3 |
28. Zn(NO3)2, 3PO4 | 28. Na2S + Al(NO3)3 |
29. (NH4)2SO4, RbHSO3 | 29. SnCl2 + Na2SO3 |
30. SnSO4, KF | 30. SnCl2+ K2CO3 |