Video: Dab tsi yog pKa ntawm cov kua qaub muaj zog?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Cov kua qaub muaj zog yog txhais los ntawm lawv cov pKa. Cov kua qaub yuav tsum muaj zog nyob rau hauv aqueous tov tshaj ib hydronium ion , yog li nws pKa yuav tsum qis dua li ntawm a hydronium ion . Yog li ntawd, muaj zog acids muaj pKa ntawm <-174.
Xav txog qhov no, pKa cuam tshuam li cas rau acid zog?
Re: Kev sib raug zoo ntawm pka ua , ka, thiab acidity zog Raws li qhov tshwm sim, cov tshuaj tiv thaiv yuav nyiam ua kom tiav kev sib cais ntawm cov tsis muaj zog kua qaub , yog li muab nws muaj peev xwm pub dawb rau proton (muaj zog kua qaub ). pKa yog qhov opposite ho, qhov loj dua pKa , lub weaker lub kua qaub yog.
Tsis tas li ntawd, pKa ntawm cov kua qaub tsis muaj zog yog dab tsi? Yog li ntawd, pKa tau qhia raws li qhov ntsuas los qhia txog acidity ntawm tsis muaj zog acids , qhov twg pKa yog txhais raws li nram no. Piv txwv li, Ka tas li rau acetic kua qaub (CH3TZS) is 0.0000158 (= 10-4.8), tab sis pKa qhov tsis tu ncua yog 4.8, uas yog ib qho yooj yim qhia. Tsis tas li ntawd, qhov me me pKa tus nqi, lub zog kua qaub.
Cov lus nug tseem yog, pKa ntawm lub hauv paus muaj zog yog dab tsi?
Methyllithium, CH3Li, yog ib qho zoo kawg lub hauv paus muaj zog . Conversely, acetylide ion, HCC (–) yog muaj zog txaus kom zoo deprotonate tej acid nrog a pKa qis dua ~ 25, thiab acetate ion (CH3COO(–)) tseem tsis muaj zog, tsuas yog tuaj yeem deprotonate cov kua qaub nrog ib qho pKa qis dua 5.
Cov kua qaub puas muaj pKa siab lossis qis?
Re: pKa thiab nws txoj kev sib raug zoo nrog npaum li cas acidic ib yam dab tsi yog -> 10^- pKa = Ka. A qis pka txhais tau tias tus nqi Ka yog siab dua thiab a siab dua Ka nqi txhais tau tias kua qaub dissociates yooj yim dua vim nws muaj ib Qhov loj dua concentration ntawm Hydronium ions (H3O+).
Pom zoo:
Koj puas ntxiv cov kua qaub rau hauv lub hauv paus lossis lub hauv paus rau cov kua qaub?
Ntxiv cov kua qaub ua kom cov concentration ntawm H3O + ions hauv cov tshuaj. Ntxiv ib lub hauv paus txo cov concentration ntawm H3O + ions hauv cov tshuaj. Cov kua qaub thiab lub hauv paus zoo li cov tshuaj tiv thaiv. Yog hais tias lub hauv paus yog ntxiv rau cov kua qaub, cov tshuaj yuav tsis acidic thiab txav mus rau nruab nrab ntawm pH nplai
Puas muaj zog npaum li cas yog cov kua qaub los yog cov hauv paus daws teeb meem?
Qhov ntau ntawm 0 mus rau 14 muab kev ntsuas ntawm kev sib piv lub zog ntawm cov kua qaub thiab cov hauv paus daws teeb meem. Cov dej ntshiab thiab lwm cov kev daws teeb meem nruab nrab muaj tus nqi pH ntawm 7. Tus nqi pH tsawg dua 7 qhia tias cov kua qaub yog acidic, thiab pH tus nqi ntau dua 7 qhia tias cov tshuaj yog qhov yooj yim
Koj pom li cas pH ntawm qhov sib npaug ntawm cov kua qaub thiab lub hauv paus muaj zog?
Ntawm qhov sib npaug, qhov sib npaug ntawm H + thiab OH- ions yuav sib xyaw ua H2O, ua rau pH ntawm 7.0 (tsis nruab nrab). Lub pH ntawm qhov sib npaug ntawm qhov sib npaug ntawm qhov titration yuav ib txwm yog 7.0, nco ntsoov tias qhov no tsuas yog muaj tseeb rau titration ntawm cov kua qaub muaj zog nrog lub hauv paus muaj zog
Cov piv txwv ntawm tsev neeg cov kua qaub thiab cov hauv paus yog dab tsi?
Daim ntawv teev cov tsev Bases & Acids Baking Soda. Baking soda yog lub npe nrov rau sodium bicarbonate, paub tshuaj raws li NaHCO3. Diluted Soaps. Tsev neeg Ammonia. Tsev Neeg Vinegar. Citric Acid
Yuav ua li cas koj txiav txim siab uas cov kua qaub muaj zog raws li pKa?
Siv "Lub zog tsis muaj zog ntawm cov kua qaub, lub zog ntawm lub hauv paus Conjugate" kom tau txais lub zog ntawm cov hauv paus los ntawm lub rooj pKa. Ntawm no yog lub hauv paus ntsiab lus tseem ceeb: Qhov kev txiav txim ntawm lub hauv paus lub zog yog qhov hloov pauv ntawm acid zog. Qhov tsis muaj zog acid, qhov muaj zog ntawm conjugate puag