Post on 24-Jun-2015
description
Determinación del Punto de equivalencia de una titulación potenciométrica por el método de la primera derivada:
HCl
0 5 10 15 20 25 30 35 40 450
1
2
3
4
5
6
primera derivada del pH
0.00 5.00 10.00 15.00 20.00 25.00 30.00 35.00 40.00 45.0002468
101214
7.02
pH vs mL
Volumen de NaOH (mL)
pH d
e la
diso
lució
n
mL NaOH
pH ΔmL derivada del pH
2.00 0.67
4.00 0.72 3.00 0.025
6.00 0.78 5.00 0.03
8.00 0.86 7.00 0.04
10.00 0.96 9.00 0.05
12.00 1.06 11.00 0.05
14.00 1.26 13.00 0.1
16.00 1.40 15.00 0.07
18.00 1.63 17.00 0.115
20.00 2.22 19.00 0.295
21.00 7.02 20.50 4.8
23.00 11.45
22.00 2.215
25.00 11.71
24.00 0.13
27.00 11.79
26.00 0.04
29.00 11.85
28.00 0.03
31.00 11.85
30.00 0
33.00 11.89
32.00 0.02
35.00 11.92
34.00 0.015
37.00 11.95
36.00 0.015
39.00 11.96
38.00 0.005
40.00 11.98
39.50 0.02
HAc
0 5 10 15 20 25 30 35 40 450
0.51
1.52
2.53
3.54
4.55
ΔpH/ΔmL
0 5 10 15 20 25 30 35 40 4502468
101214
10.89
pH vs mL
mL de NaOH
pH
NaOH
mL NaO
HpH
promedio mL
ΔpH/ΔmL
0 2.19
1 2.91 0.5 0.72
2 3.34 1.5 0.43
3 3.59 2.5 0.25
4 3.8 3.5 0.21
5 3.94 4.5 0.14
6 4.08 5.5 0.14
7 4.22 6.5 0.14
8 4.33 7.5 0.11
9 4.44 8.5 0.11
10 4.55 9.5 0.11
11 4.66 10.5 0.11
12 4.78 11.5 0.12
13 4.89 12.5 0.11
14 5.03 13.5 0.14
15 5.15 14.5 0.12
16 5.34 15.5 0.19
17 5.55 16.5 0.21
18 5.85 17.5 0.3
19 6.52 18.5 0.67
20 10.89 19.5 4.37
21 11.35 20.5 0.46
22 11.54 21.5 0.19
23 11.64 22.5 0.1
24 11.72 23.5 0.08
25 11.77 24.5 0.05
26 11.81 25.5 0.04
27 11.85 26.5 0.04
28 11.87 27.5 0.02
29 11.9 28.5 0.03
30 11.92 29.5 0.02
31 11.93 30.5 0.01
32 11.94 31.5 0.01
33 11.96 32.5 0.02
34 11.97 33.5 0.01
35 11.99 34.5 0.02
36 11.99 35.5 0
37 11.99 36.5 0
38 12.01 37.5 0.02
39 12.01 38.5 0
0 5 10 15 20 25 30 35 40 45
-1.6
-1.4
-1.2
-1
-0.8
-0.6
-0.4
-0.2
0
0.2
ΔpH/ΔmL
0 5 10 15 20 25 30 35 40 450
2
4
6
8
10
12
14
5.92
pH vs mL
mL de HAc
pH
NH3
0 5 10 15 20 25
-6
-5
-4
-3
-2
-1
0
ΔpH/ΔmL
mL de HAc
pH promedio mL
ΔpH/ΔmL
2 12.18
4 12.19
3 0.005
8 12.16
6 -0.0075
10 12.12
9 -0.02
12 12.02
11 -0.05
14 11.91
13 -0.055
16 11.66
15 -0.125
18 10.85
17 -0.405
20 8.73 19 -1.0622 5.92 21 -1.40524 5.46 23 -0.2326 5.24 25 -0.1128 5.06 27 -0.0930 4.94 29 -0.0632 4.83 31 -0.05534 4.76 33 -0.03536 4.69 35 -0.03538 4.64 37 -0.02540 4.59 39 -0.025
mL de HCl
pH promedio mL
ΔpH/ΔmL
1 10.132 9.88 1.5 -0.253 9.67 2.5 -0.214 9.49 3.5 -0.185 9.31 4.5 -0.186 9.08 5.5 -0.237 8.85 6.5 -0.238 8.41 7.5 -0.449 2.79 8.5 -5.62
10 1.82 9.5 -0.9711 1.58 10.5 -0.2412 1.42 11.5 -0.1613 1.3 12.5 -0.1214 1.23 13.5 -0.0715 1.15 14.5 -0.0816 1.1 15.5 -0.0517 1.06 16.5 -0.0418 1.01 17.5 -0.0519 0.98 18.5 -0.0320 0.95 19.5 -0.0321 0.92 20.5 -0.03
0 5 10 15 20 25 30 350
2
4
6
8
10
12
2.79
pH vs mL
mL HCl
pH