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Kemi: syre og base

Opsamling på kemi s. 114

Opskriv et reaktionsskema for henholdsvis en syres(NH4+) og en bases(NH3) reaktion med vand og ved hjælp af ligevægts loven opskrive styrkekonstanten for både syre og base NH4+ + H2O => H3O+ + NH3 NH3 + H2O => OH- + NH4+ Ks=[B]*[H3O+]/[S] syre styrke Ks=[OH-]*[S]/[B] base styrke
Hvordan kan man vurdere syrens og basens styrke ud fra værdien af deres styrkekonstanter eller styrkeeksponenter? for basen bestemmes styrken ved at styrkekonsanten er lav og eksponenten er høj. For syre er det modsat. styrken bestemmes ved at styrkekonstanten er høj og eksponenten er lav
Forklar korrosponderende syrebase par. samt parrets sammenhæng mellem styrkekonstanterne og sammenhængen mellem syren og basens styrke eksponenter. Ks*Kb=1,0*10^-14 M^2 pKs+pKb=14
Beregn den aktuelle stofmængde i oxium i en ethansyre(0,015 M) CH3COOH i en opløsning af ammoniak (0,025 M)
Beregn pH i opløsninger af stærke, middelstærke hhv. svage syrer og baser. angiv sidetal!!!
Hvad forstår man ved et puffersystem og hvordan man beregner pH i en pufferopløsning? En pufferopløsning består af et korresponderende syre-basepar, der skaber et såkaldt puffersystem der dæmper pH-ændringen ved tilsætning af en syre eller base.
hvordan beregner man pH-ændring ved tilsætning af et kendt stofmængde stærk syre eller stærk base til et kendt puffersystem. pH=pKs + Log B/S puffer ligningen.
Created by: Fransgaard



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