Video: Vim li cas cov acids muaj zog pKa tsawg?
2024 Tus sau: Stanley Ellington | [email protected]. Kawg hloov kho: 2023-12-16 00:17
A qis pka txhais tau tias tus nqi Ka yog siab dua thiab tus nqi siab dua Ka txhais tau tias tus kua qaub dissociates yooj yim dua vim nws muaj ib Qhov loj dua concentration ntawm Hydronium ions (H3O+).
Ib yam li ntawd, pKa cuam tshuam li cas rau acid zog?
Re: Kev sib raug zoo ntawm pka ua , ka, thiab acidity lub zog Raws li qhov tshwm sim, cov tshuaj tiv thaiv yuav ua rau muaj kev sib cais ntau dua ntawm cov tsis muaj zog kua qaub , yog li muab nws lub peev xwm muaj zog los pub cov tshuaj proton (muaj zog kua qaub ). pKa ua yog qhov rov qab tab sis, qhov loj dua pKa ua , lub weaker lub kua qaub yog
Kuj Paub, pKa ntawm cov kua qaub tsis muaj zog yog dab tsi? Yog li ntawd, pKa ua tau qhia raws li qhov ntsuas los qhia txog acidity ntawm tsis muaj zog acids , qhov twg pKa ua yog txhais raws li hauv qab no. Piv txwv li, Ka tas li rau acetic kua qaub (CH3COOH) yog 0.0000158 (= 10-4.8), tab sis pKa ua tas li yog 4.8, uas yog qhov qhia tau yooj yim dua. Tsis tas li ntawd, qhov me me pKa ua tus nqi, lub zog kua qaub.
Kuj Paub, qhov qis pKa txhais li cas?
Cov ntsiab lus tseem ceeb: pKa txhais Cov pKa ua tus nqi yog ib txoj kev siv rau qhia lub zog ntawm ib tug acid. pKa yog tsis zoo cav ntawm cov kua qaub dissociation tas li los yog Ka tus nqi. A qis pka tus nqi qhia tias muaj zog acid. Tias yog, qis tus nqi qhia cov kua qaub ntau dissociates hauv dej.
Vim li cas cov acids muaj zog pH tsawg?
Txij li thaum lub concentration ntawm cov tsis muaj zog kua qaub yog ntau dua, txawm tias nws tsuas yog dissociates ib feem, nws tsim ntau H + ions tshaj qhov muaj zog acid , ua a qis pH . Nyob rau hauv sib npaug zos concentration, a muaj zog acid yuav feem ntau muaj a qis pH tshaj qhov tsis muaj zog kua qaub , los ntawm muaj zog ib tug yuav pub ntau protons rau cov tshuaj.
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