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2003
543
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:
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- 2003 . . 65.
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, 2003
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, 2003
1 2 [1].
. . , , , . , , , . , [2].
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1
1.
() : . :
BaSO4↓ D 2+ +
, (): :
= [2+] [ ]
, , , :
|
|
= [2+]3 ∙
: , .
, .
:
= f ∙
f = / , , . I
i z i .
fi :
I < 0,01;
I < 0,1,
:
I < 0,2.
. , ( 1.1.5 [1]).
12 15.
1. AgI, 25 2,865 ∙ 106 /.
. AgI
AgI↓ D Ag+ + I
:
AgI = [Ag+] ∙ [I]
(/). AgI 234,772 /, AgI
[AgI] = 2,865 ∙ 106/234,772 = 1,22 ∙ 108 /.
1 Ag+ 1 I. , :
[Ag+] = [I] = [AgI] = 1,22 ∙ 108 /.
[Ag+] [I] , :
AgI = 1,22 ∙ 108 ∙ 1,22 ∙ 108 = 1,5 ∙ 1016.
2. Ag2CrO4, 100 0,002156 .
. (/):
100 0,002156
1000 ¾ ¾ ¾ ¾ ¾ ¾
x = 1000 ∙ 0,002156/100= 0,02156 /.
Ag2CrO4 331,73 /, Ag2CrO4 (/)
[Ag2CrO4] = 0,02156/331,73 / = 6,5 ∙ 105 /.
:
Ag2CrO4↓ D 2Ag+ +
[Ag+] = 2 ∙ 6,5 ∙ 105 = 1,3 ∙ 104 /;
[ ] = 6,5 ∙ 105 /;
= [Ag+]2 [ ] = (1,3 ∙ 104)2 ∙ 6,5 ∙ 105 ≈ 1,1 ∙ 1011.