Nõrga elektrolüüdi dissotsiatsioonikonstandi määramine (0)

Töö nr.8 Nõrga elektrolüüdi dissotsiatsioonikonstandi määramine
Valemid: Rx=R*(AD/DB) K=l/S K=R*κ
Andmed: c= 0.01 M
R=(1/κ)*(l/S) R=K*(1/κ) λ0,t=λ0,25*(1+α*(t-25))
κ= 0.125 S*m-1
Kc=α2*C/(1-α) λ0=λ0,+ + λ0,- λ=λ0*α
t= 19 °C
λ=κ/C
25°C λ0, CH3COO -= 0.00409 S*m2/mol
25°C α CH3COO-= 0.0206
25°C λ0,H+= 0.03498 S*m2/mol
25°C α H+= 0.0142
19°C λ0,CH3COO-= 0.003584476 S*m2/mol
19°C λ0,H+= 0.031999704 S*m2/mol
λ0CH3COOH= 0.03558418 S*m2/mol
I osa 0,01 M KCl lahuse takistuse Rx mõõtmine
Katse nr Takistus R Reohordi õla AD pikkus Lahusekihi takistus Rx Rx keskmine väärtus Elektroodide konstant K
I 151 10 151 150.6262626263 18.8282828283
II 184 9 150.5454545455
III 123 11 150.3333333333
II osa Kalibreerimisgraafiku koostamine
1,082 M CH3COOH lahusest 0,4 M lahuse saamiseks võtsin 36,97 ml 100ml mõõtkolbi ja täitsin märgini.
Katse nr Lahuse konts- entratsioon C(M) Takistussalve takistus R Reohordi õla AD pikkus Lahusekihi takistus Rx Rx keskmine väärtus κ λ α Kc 1 0.4 175 10 175 174.6835016835 0.1077851236 0.0002694628 0.0075725451 2.31123955837766E-005 213 9 174.2727272727 143 11 174.7777777778 2 0.2 259 10 259 260.3804713805 0.0723106565 0.0003615533 0.0101605062 2.08591165510962E-005 317 9 259.3636363636 215 11 262.7777777778 3 0.1 329 10 329 327.2592592593 0.0575332318 0.0005753323 0.016168205 2.65706856959726E-005 396 9 324 269 11 328.7777777778 4 0.05 465 10 465 463.4983164983 0.040622117 0.0008124423 0.02283156 0.000026673 565 9 462.2727272727 379 11 463.2222222222 5 0.025 654 10 654 650.7407407407 0.0289336162 0.0011573446 0.0325241342 2.7334514119492E-005 792 9 648 532 11 650.2222222222 6 0.0125 934 10 934 927.7878787879 0.0202937366 0.0016234989 0.045624177 2.7263441181954E-005 1131 9 925.3636363636 756 11 924 7 0.00625 1314 10 1314 1312.7239057239 0.0143429115 0.0022948658 0.0644911824 2.77864337655115E-005 1591 9 1301 .7272727273 1082 11 1322.4444444445 8 0.003125 1801 10 1801 1812 .5151515152 0.0103879313 0.003324138 0.0934161756 3.00805811859735E-005 2186 9 1788.5454545455 1512 11 1848 Kontrolllahus 0.0921817056 354 10 354 354.6464646465 0.0530902877 0.0005759308 0.0161850251 2.45447189800999E-005 433 9 354.2727272727 291 11 355.6666666667
Lahuse konts- entratsioon C(M) κ
0.4 0.1077851236
0.2 0.0723106565
0.1 0.0575332318
0.05 0.040622117
0.025 0.0289336162
C= 0.0921817056 M
0.0125 0.0202937366
0.00625 0.0143429115
0.003125 0.0103879313
Lahuse konts- entratsioon C(M) λ
0.4 0.0002694628
0.2 0.0003615533
0.1 0.0005753323
0.05 0.0008124423
0.025 0.0011573446
λ= 0.0006913936 S*m2/mol
0.0125 0.0016234989
0.00625 0.0022948658
0.003125 0.003324138
1/λ λ*C
3711.087267525 0.1077851236
2765.8440629471 0.0723106565
1738.1258941345 0.0575332318
1230 .8565808298 0.040622117
864.0468526466 0.0289336162
615.9535944206 0.0202937366
λ*C= 0.0435906261 S/m
Kc= 3.54897385766076E-005
435.7553201001 0.0143429115
300.8298685622 0.0103879313