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Quantitas constans dissociationis acidi

Quantitas constans dissociationis acidi exemplo reactionis equilibrii: Sinistra acidum aceticum CH3COOH acidum lente protonem (viride) in aquam H2O dat, itaque dextra in ion acetati CH3COO- et ion hydronii H3O+ sub> resultans. Nigre: carbonium, rubre: oxygenium, albe: hydrogenium.

Quantitas constans disscociationis acidi naturam acidorum disscociationis in aequosa solutione valor pKa exprimit. Si complures aequilibrii cum acido polyprotico spectentur, valores pka1, pka2, pkan scribitur.

Aequatio generalis aequilibrii singularis (cum acido monoprotico) scribito:

ut HA acidum[1] in solutione aequosa hinc in A- basim coniugatam dissocians describat.

Deinde HA, A- "in aequilibrio esse" nihil mutationis occurrere significat. De consuetudine valor constans dissociationis pkA scribitur sic:

Cum in plerisque solutionibus aequosis concentratio aquae constans esset, aequilibrium simplificetur, calculatio valoris pKa ergo simplicor apparabit:

Aequilibrium simplicius scribitur

.

Idcirco quantitas constans disscociationis acidi ex concentratione hydrogenii H+ derivetur.

Vice versa valor pH circumiectus aequosi gradum dissociationis acidi HA adducit.

Nexus interni

  1. quoque: acidum Brønstediense, secundum Ioannem Brønsted.

Nexus externi

[recensere | fontem recensere]
  • Notae plures de valoribus pKa. (Anglice)
stipula

Haec stipula ad chemiam spectat. Amplifica, si potes!

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Quantitas constans dissociationis acidi
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