20 142,144146.
20. NaOH [(NaOH) = = 0,15 /] HCl c 0,30 / .
. NaOH , HCl , .
, 100,00 (V0) NaOH [0 = (NaOH) = 0,15 /]. HCl (V ), NaOH ( . ):
100,00 0,15 = V 0,30; V = 50,00 .
, .
1. , + , NaOH (3).
pH = 14 pOH = 14+lg 0,15 = 13,18.
2. . 25,00 (50%) HCl n(HCl) = = 25,00 103 0,30 = 7,50 103 . NaOH :
100,00 103 0,15 7,50 103 = 7,50 103 .
(NaOH) = 7,50 ∙ 103/100,00 ∙ 103 = 7,50 ∙ 102 /,
= 14 + lg 7,50 ∙ 102 = 12,88.
, , :
0 ; V0 ; V .
45,00 HCl (45,00: 50,00 100 = 90%):
49,50 HCl (49,50: 50,00 100 = = 99%),
49,95 HCl (49,95: 50,00 100 = = 99,9%):
3. , = 1/2 W = 7.
Cl. 50,05 HCl (50,05: 50,00 100 = 100,1 %):
, 0 ∙ V0= 100,00 0,15 = = 50,00 ∙ 0,30, :
50,50 HCl (50,50: 50,00 100 = = 101 %):
55,00 HCl (55,00: 50,00 100 = = 110 %):
. 1, (. 1).
1
VT, | - | ||
NaOH | 14+lg 0(NaOH) | 13,18 | |
25,00 | NaOH | 12,88 | |
45,00 | NaOH | -″- | 12,18 |
49,50 | NaOH | -″- | 11,18 |
49,95 | NaOH | -″- | 10,18 |
50,00 | H2O | = 1/2 W | 7,00 |
50,05 | HCl | 3,82 | |
50,50 | HCl | -″- | 2,82 |
55,00 | HCl | -″- | 1,82 |
10,18 3,82 0,1% . , . , : ( 3,14,4; =4,0), ( 4,26,2; =5,0), ( 6,07,6; =7,0), ( 8,210,0; =9,0).
|
|
. 1. 0,15 / 0,30 /