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DETERMINAREA pH-ULUI APEI
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Noţiune pH-ului pH este prescurtarea prescurtarea de la "pondus hydrogenii". Noţiunea a fost introdusă de către omul de ştiinţă danez S.P.L. Sorensen, în anul 1909, pentru a exprima concentraţii mici de ioni de hidrogen şi a fost definită ca:
logaritmul zecimal cu semn schimbat al
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Caracterul apei în funcţie de pH
[H+]
pH
1
10-1
10-2
10-3
10-4
10-5
10-6
10-7
10-8
10-9
0
1
2
3
4
5
6
7
8
9
C a r
Foarte acid
Acid
Slab acid
Neu
tru
Slab alcalin
10-
10-
10-
10-
10
11
12
13
14
10
11
12
13
14
Alcalin
10-
Foarte alcalin
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Metode de determinare ale pH-ului
I. Metode colorimetrice II. Metode electrometrice (potenţiometrice)
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I. Metodele colorimetrice de măsurare a pH-ului pH-ului s unt unt::
1.Cu ajutorul comparatorului Hellige
3. Cu ajutorul indicatorilor de pH
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Principiu metodelor colorimetrice Principiul metodelor colorimetrice constă în compararea culorii probei de analizat, în care s-a adăugat un indicator, cu o scară etalon.
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Dezavantajele metodelor colorimetrice
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1.Determinarea colorimetrică a pH -ului -ului folos fol osind ind com compa para rattorul He Hell llige ige
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Modul de lucru: Într-una din cuvele aparatului
se introduc 10ml de apă de analizat şi 0,5ml indicator potrivit pH-ului apei de analizat. Se agită şi se introduce cuva în orificiul din dreapta
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2. Determinarea colorimetrică a pH -ului -ului folosind scara de comparare Reactivi necesari roşu de metil
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Culorile de viraj ale diferiţilor indicatori
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