Hidroliza Acetatului de Etil
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Transcript of Hidroliza Acetatului de Etil
7/26/2019 Hidroliza Acetatului de Etil
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Datele experimentale
Nr t (min) Vt (mL) 800/Vt (mL) V0-Vt (mL) 800(V0-Vt)
(mL)
V0Vt (mL2 ) 800(V0-Vt)/V0Vt
(mL-1
)
k2=(800/t)(V0-Vt)/V0Vt (mL-1min-1 )
1 3,06 15,60 51,2821 7,30 5840,0 357,2400 16,347553 5,342338
2 5,43 11,90 67,2269 11,00 8800,0 272,5100 32,292393 5,947034
3 7,96 9,40 85,1064 13,50 10800,0 215,2600 50,171885 6,303001
4 11,45 7,40 108,1081 15,50 12400,0 169,4600 73,173610 6,390708
5 14,30 6,00 133,3333 16,90 13520,0 137,4000 98,398836 6,881037
6 15,96 5,60 142,8571 17,30 13840,0 128,2400 107,922645 6,762070
7 18,23 5,20 153,8462 17,70 14160,0 119,0800 118,911656 6,522856
8 20,30 4,80 166,6667 18,10 14480,0 109,9200 131,732169 6,489269
Testele Q si Student t
Nr Xi (k1 ) gap Qcalc Xi-Xmed (Xi-Xmed )2
1 5,342338 0,604696 0,392992 -9,874514E-01 9,750603E-01
2 5,947034 0,355967 0,231343 -3,827555E-01 1,465017E-01
3 6,303001 0,087708 0,057001 -2,678851E-02 7,176242E-04
4 6,390708 0,087708 0,057001 6,091917E-02 3,711145E-03
5 6,489269 0,033586 0,021828 1,594802E-01 2,543395E-02
6 6,522856 0,033586 0,021828 1,930664E-01 3,727462E-02
7 6,762070 0,118967 0,077317 4,322813E-01 1,868672E-01
8 6,881037 0,118967 0,077317 5,512483E-01 3,038747E-01
VALORI
Range 1,538700
Qtab (pentru n=8, 90%) 0,470
Nr determinari luate in calcul 8
Xmed (media valorilor pt k 2 ) 6,329789
t tab (pentru n-1=7, 95%) 2,3650
Deviatia standard 0,489816
Intervalul de incredere (min) 5,920227
Intervalul de incredere (max) 6,739351
V 0 (mL) 22,9
!Nu se elimina nici o valoare pe baza testului Q (toate valorile au
nivelul de incredere >90%). Intervalul de incredere pentru valoarea
medie a constantei de viteza, pentru un nivel de incredere 95%
este != 5,920227-6,739351
!Coeficientul de determinatie este R2=0,9965 iar coeficientul
de corelatie liniara este R=0,998248
!Ecuatia cinetica pentru hidroliza persulfatului de potasiu este:
800/Vt=k2t+(800/V0 )
Aceasta reprezinta ecuatia unei drepte de forma y= bx+a unde:y=800/Vt, x=t, b=k2, a=800/V0
Din ecuatia dreptei de regresie (y=6,8289x-3,9174) se afla
parametrii a si b: a=-3,9174, b=6,8289
k2=6,8289 mL-1min-1
!Timpul de injumatatire este t1/2=800/(k2V0 )
t1/2=800/(6,8289 mL-1min-1 *22,9mL)
t1/2=5,115684 min
8 0 0 ( V 0 - V t ) / V 0 V t
35,003000
70,002000
105,001000
140,000000
Timp (min)
5,5 11 16,5 22
y = 6,8289x - 3,9174
R# = 0,9965
i xi yi xi2 yixi
1 3, 06 16, 347 553 9,3 636 50, 0235 14
2 5 ,4 3 3 2, 29 23 93 2 9, 48 49 1 75 ,3 47 69 4
3 7 ,9 6 5 0, 17 18 85 6 3, 36 16 3 99 ,3 68 20 6
4 1 1,45 7 3,17 36 10 1 31 ,1 02 5 8 37 ,8 37 83 8
5 1 4,30 9 8,39 88 36 2 04 ,4 90 0 1 40 7,10 33 48
6 1 5,96 1 07 ,9 22 64 5 2 54 ,7 21 6 1 72 2,44 54 15
7 1 8,23 1 18 ,9 11 65 6 3 32 ,3 32 9 2 16 7,75 94 89
8 2 0,30 1 31 ,7 32 16 9 4 12 ,0 90 0 2 67 4,16 30 28
sum xi sum (xi )2 sum yi sum yixi
96,690 1436,947100 628,950747 9434,048531
!Calculul pentru parametrii dreptei de regresie
manual se face rezolvand sistemul:
b*$xi +n*a=$yi
b*$xi2
+a*$xi =$yixi
b*96,69+8*a =628,950747 |*12,08625
b*1436,9471+96,69*a=9434,048531
1168,6195*b+96,69*a=7601,655965
1436,9471*b+96,69*a=9434,048531
268,3276*b=1832,392566
b=6,828938=k2
a=(628,950747-(6,828938*96,69))/8=-3,917408
xi-x & (xi-x & )2 yi-y & (yi-y & )2
-9,026250 81,473189 -62,271290 3877,713500
-6,656250 44,305664 -46,326450 2146,139975
-4,126250 17,025939 -28,446958 809,229410
- 0, 63 62 50 0 ,4 04 81 4 - 5, 44 52 33 2 9, 65 05 59
2 ,2 13 75 0 4 ,9 00 68 9 1 9,77 99 93 3 91 ,2 48 10 4
3 ,8 73 75 0 1 5,00 59 39 2 9,30 38 02 8 58 ,7 12 81 4
6,143750 37,745664 40,292813 1623,510782
8,213750 67,465689 53,113326 2821,025383
x & sum (xi-x & )2 y & sum (yi-y & )2
12,086250 268,327588 78,618843 12557,230528
!Calculul pentru coeficientii de corelatie si de
determinatie se face manual folosind ecuatiile:
R=b*sqrt( $(xi-x & )2 )/sqrt( $(yi-y & )2 )
x &=( $xi )/n=96,69/8=12,08625
y &=( $yi )/n=628,950747/8=78,618843
R=6,828938*sqrt(268,327588)/sqrt(12557,230548)
R=0,998249
R2=0,996501
HIDROLIZA ACETATULUI DE ETIL