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Syree

Kemi B - Syre Baser

QuestionAnswer
Hvad er en syre? En syre er et molekyle eller en ion, som kan afgive en hydron.
Hvad er en base? En base er et molekyle eller en ion, som kan optage en hydron.
Hvad er en hydron? H+
En syre-basereaktion er det samme som en hydronoverførsel
Den generalle pH formel: pH=-log[H3O+]
Hvis pH undersøger den aktuelle stofmængde af H3O+, hvad undersøger pOH den aktuelle stofmængde af OH-
pH+pOH= 14
Ks= ([B]*[H3O+])/[S]
Hvorfor er Ks uafhængig af syrens koncentration? Fordi Ks er en ligevægtskonstant
Hvad afhænger Ks af? temperaturen
Kb= ([OH-]*[S])/[B]
Hvornår er en syre stærk? pKs<0
Hvordan bestemmer man pH for en stærk syre? pH=-logCs
Hvornår er en syre middelstærk og svag? 0<Pks<10
Hvordan bestemmer man pH for middelstærk og svag syre? pH=-log[H3O+]
Hvad er en amfolyt? En amfolyt, hydronolyt eller protolyt er en kemisk forbindelse som er i stand til både at virke som syre og som base.
pOH for en stærk base -log(cb)
Kb= ([S]*[OH-])/[S]
pOH for en middelstærk base -log[OH-]
pOH for en svagbase (4 < pkb < 10) pOH=1/2*(pKb-logCb)
Skriv pufferligningen: pH=pKs+log([B]/[S])
alternativ for pufferligning med stofmængde pH=pKs+log(nb/ns)
Created by: charshakh
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