ph vrednost - dragan stojanović
TRANSCRIPT
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pH –vrednost Dragan Stojanović, dipl. Hemičar
Osnovna škola „Božidar Dimitrijević Kozica“
Bradarac
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Kiselost rastvora• Vodeni rastvori mogu biti kiseli, bazni ili
neutralni što zavisi od odnosa količine vodoničnih i hidroksidnih jona u rastvoru
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Šta je pH – vrednost?• pH vrednost se može definisati
kao mera kiselosti ili baznosti rastvora.
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pH skalaSorensenova pH skalapH vrednost se kreće u intervalu od 0 do 14pH = 0-7 rastvor je kiseopH = 7 rastvor je nautralanpH = 7-14 rastvor je bazan
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pH skala
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pH skala• Što je pH vrednost niža, rastvor je kiseliji• Što je pH vrednost viša rastvor je bazniji• Kada je pH =7 rastvor je neutralan
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pH skala
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Indikatori
• Slabe organske kiseline ili baze koje menjaju boju u zavisnosti od kiselosti sredine nazivaju se indikatori
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Lakmus hartija
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Fenolftalein
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Metil – oranž
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Univerzalna indikatorska hartija
Hartija impregnirana smešom indikatora
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pH - metar
Uređaj koji se koristi za precizno merenje pH
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HVALA NA PAŽNJI HVALA NA PAŽNJI