ZADANIE 1 |
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ENEK - półogniwo kalomelowe |
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Przygotować roztwór buforowy: |
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Potencjał półogniw |
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CH3COOH : CH3COONa = 1 : 2 |
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Vander:
odczytane z tabeli 14.7C z ksiązki "Obliczenia Fizykochemiczne"
0,2456 |
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T = 20,1 0C |
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Vander:
Odczytane z tabeli 14.6 z ksiązki " Obliczenia Fizykochemiczne "
0,3450 |
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Vander:
Odczytane z tabeli 14.6 z ksiązki " Obliczenia Fizykochemiczne "
-0,7620 |
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T [ 0C ] |
20,1 |
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0,2456 |
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Pomiar SEM |
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Schemta ogniwa |
SEM ogniwa [V] |
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pomiar |
średnia |
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Zn | ZnSO4 m = 0,05 || CuSO4 m = 0,05 | Cu Ogniwo Daniela |
1,057 |
1,057 |
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1,057 |
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1,057 |
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Hg, Hg2Cl2 | KCl nasyc. || CuSO4 m = 0,05 | Cu |
0,043 |
0,043 |
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0,043 |
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0,043 |
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Hg, Hg2Cl2 | KCl nasyc. || ZnSO4 m = 0,05 | Zn |
-1,021 |
-1,0197 |
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-1,02 |
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-1,018 |
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Potencjał półogniw |
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Ogniwo |
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( obliczone dla m = 0,05 mol∙kg-1) |
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Zn | ZnSO4 m = 0,05 || CuSO4 m = 0,05 | Cu |
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1 |
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0,249969977427771 |
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1,057 |
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2 |
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-0,857030022572229 |
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a |
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1,0627 |
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EOBLICZONA ( z wzoru NERNSTA ) [V] |
1,1070 |
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1 |
0,3450 |
0,05054 |
1,1153 |
6 |
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2 |
-0,7620 |
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T [ K ] |
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293,25 |
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1 |
0,2 |
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8,314 |
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96487 |
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0,05 |
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ZADANIE 3 : Pomiar pH |
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Potencjały półogniw |
Reakcje w półogniwach |
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0,2456 |
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Vander:
Odczytane z tabeli 14.6 z książki " Obliczenia Fizykochemiczne "
0,212 |
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Vander:
Odczytane z tabeli 14.6 z książki " Obliczenia Fizykochemiczne "
0,6994 |
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Obliczenoe zależności pH ( E ) i E ( pH ) dla stosowancyh ogniw: |
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Hg, Hg2Cl2 | KCl (nas.) || Sb2O3, H3O+ | Sb |
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E |
= |
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x |
pH |
pH |
= |
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x |
E |
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Hg, Hg2Cl2 | KCl (nas.) || C6H4(OH)2, C6H4O2, H3O+ | Pt |
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E |
= |
-0,444 |
- |
0,0509 |
x |
pH |
pH |
= |
8,7217 |
- |
19,645 |
x |
E |
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Pomiary pH i wyniki |
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Nr |
kwas/ zasda |
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pH obliczone |
Pomiary |
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elektorda zespolona |
półogniwo antymonowe |
półogniwo chinhydrinowe |
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pH |
SEM [ V ] |
pH |
SEM [ V ] |
pH |
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pH |
SEM |
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1 |
Silny kwas ( HCl ) |
0,1 |
1,12 |
1,19 |
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-0,378 |
1,30 |
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1,19 |
-0,378 |
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2 |
Silny kwas ( HCl ) |
0,01 |
2,05 |
2,02 |
-0,337 |
2,10 |
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2,02 |
-0,337 |
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3 |
Słaby kwas ( CH3COOH ) |
0,05 |
3,03 |
3,67 |
-0,252 |
3,77 |
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3,67 |
-0,252 |
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4 |
Słaby kwas ( CH3COOH ) |
0,005 |
3,54 |
4,07 |
-0,214 |
4,52 |
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4,07 |
-0,214 |
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5 |
Silna zasada ( NaOH ) |
0,1 |
12,88 |
12,31 |
0,234 |
13,32 |
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6,36 |
-0,136 |
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6 |
Silna zasada ( NaOH ) |
0,01 |
11,95 |
11,38 |
0,207 |
12,79 |
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2,39 |
-0,344 |
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7 |
Bufor octanowy |
1 do 2 |
-- |
6,36 |
-0,136 |
6,05 |
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8 |
Bufor kontrolny |
-- |
-- |
2,39 |
-0,344 |
1,96 |
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Obliczenia dla silnego kwasu |
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Silny kwas ( HCl ) |
0,1 |
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C |
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1,12228881433619 |
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0,1 |
0,1 |
-0,122288814336189 |
0,754590243478598 |
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Silny kwas ( HCl ) |
0,01 |
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C |
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2,04627272727273 |
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0,01 |
0,01 |
-0,046272727272727 |
0,898932894384325 |
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Obliczenia dla silnej zasady |
Dla silnej zasady wyjdzie to samo co dla kwasu solnego, więc wystarczy tylko odjąć od 14 i mamy gotowy wynik. |
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Obliczenia dla słabego kwasu |
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0,05 |
4,76 |
1,73780082874938E-05 |
3,47590365267079E-06 |
0,001864377550999 |
0,000923499771356 |
-0,000940877779643 |
3,03 |
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0,005 |
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3,47862160921915E-07 |
0,000589798407019 |
0,000286210199366 |
-0,000303588207653 |
3,54 |
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