21 143, 147, 148.
21. (0 = 0,20 /) c 0,40 / .
. , , . .
, 100,00 (V0) H (0 = 0,20 /). (V ), HCOOH.
100,00 0,20 = V 0,40; V = 50,00 .
1. (2):
= 1/2 1/2 lg 0 = 1/2 3,75 1/2 lg 0,20 = 2,57.
2. , . (7). , , :
= ( ∙ Vo ∙ V)/ Vo; c = ∙ V/ Vo.
/c = [( ∙ Vo ∙ V)/ Vo] / ( ∙ V/ Vo) =
= ( ∙ Vo ∙ V) / ∙ V/ Vo.
,
25,00 (50 %) :
45,00 H (45,00: 50,00 100 = 90 %):
49,50 H (49,50: 50,00 100 = = 99 %):
49,95 (99,9 %), :
3. , = = = 0,2 /. (5):
4. . 20. , 50,05 (100,1%):
= 14 + lg [(50,05 50,00) 0,40/100,00] = 10,30.
50,50 (101%)
= 14 + lg [(50,50 50,00) 0,40/100,00] = 11,30.
55,00 (110%)
= 14 + lg [(55,00 50,00) 0,40/100,00] = 12,30.
. 2, (. 2).
2
VT, | - | ||
= 1/2 1/2 lg 0 | 2,57 | ||
25,00 | 3,75 | ||
45,00 | -″- | 4,70 | |
49,50 | -″- | 5,75 | |
49,95 | -″- | 6,75 | |
50,00 | K | = 7+1/2 +1/2 lg c | 8,53 |
50,05 | KOH | pH = 14+lg T | 10,30 |
50,50 | KOH | -″- | 11,30 |
55,00 | -″- | 12,30 |
|
|
. 2. 0,20 / 0,40 /
[3] : ( 6,88,4; =8,0), ( 6,88,4; =8,0), ( 8,09,6; =9,0), ( 8,210,0; =9,0), .