WYKONANIE ĆWICZENIA NR 4
Stała i stopień dysocjacji
| CH3COOH | pH | [H+] | [CH3COO-] | [CH3COOH] | Stopień dysocjacji(α) | Stała dysocjacji (K) |
CH3COOH 1,0 mol/dm3 |
2,58 | 10=2,58 =2,63*10-3 |
2,63*10-3 | 0,1-2,63*10-3 =0,09737 | 0.027 | |
CH3COOH 0,5 mol/dm3 |
2,55 | 2,82*10-3 | 2,82*10-3 | 0,49718 | 0,00564 | 1,7×10-5 |
CH3COOH 0,1 mol/dm3 |
2,48 | 3,31*10-3 | 3,31*10-3 | 0,09669 |
[H+]=? [H+]=10-pH
[CH3COO-]=[H+]=x- ilość cząsteczek zdysocjowanych
[CH3COOH]= c-x
(α) α = x/c
(K)…………………………………………………………………………………………………………………
2.Stała i stopień dysocjacji
| NH4OH | pH | [H+] | [OH-] | [NH4OH] | Stopień dysocjacji(α) | Stała dysocjacji (K) |
| NH4OH 1,0 mol/dm3 | 11,55 | 2,82×10-12 | 3,55×10-3 | 0,097765 | 0,0355 | 1,6×10-4 |
| NH4OH 0,5 mol/dm3 | 11,98 | |||||
NH4OH 0,1 mol/dm3 |
12,25 |
[H+]……………………………………………..………………………………………………………………………………………………………………………………………………………………………………………
[OH-]……………………………………………………………………………………………………………..
[NH4OH]………………………………………………………………………………………………………….
(α)………………………………………………………………………………………………………………… (K)…………………………………………………………………………………………………………………
Roztwory buforowe
V H2O [cm3] |
V CH3COOH [cm3] |
V CH3COONa [cm3] |
pH | [CH3COOH] | [CH3COONa] | [CH3COOH] [CH3COONa] |
|
| 1 | - | 25 | 25 | 4,92 | |||
| 2 | 10 | 20 | 20 | 4,77 | |||
| 3 | 20 | 15 | 15 | 4,67 | |||
| 4 | 30 | 10 | 10 | 4,60 | |||
| 5 | 40 | 5 | 5 | 4,57 |
1)V1…………………………………………………………………………………………………………………
C1……………………………………………………………………..….…………………………………………
V2……………………………………………………………………..………….…………………………………
C2……………………………………………………………………………………………………………………
[CH3COOH]/ [CH3COONa] =……………………………………………………………………………………
2)V1…………………………………………………………………………………………………………………
C1……………………………………………………………………..….…………………………………………
V3……………………………………………………………………..………….…………………………………
C3……………………………………………………………………………………………………………………
[CH3COOH]/ [CH3COONa] =……………………………………………………………………………………