Video: Dab tsi hloov xim ntawm litmus ntawv?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Litmus yog ib qho tsis muaj zog acidic, xim organic dye. Raws li nws ib puag ncig kev hloov los ntawm acid ( pH <7) rau hauv paus ( pH > 7), lub molecule kev hloov los ntawm protonated acid mus rau ionized ntsev. Nws xim kuj kev hloov ntawm liab mus xiav. (Qhov tiag pH thaj tsam rau qhov no xim hloov los ntawm 4.5 txog 8.3.)
Ib sab ntawm no, dab tsi hloov xim ntawm litmus ntawv?
Xiav ntawv litmus hloov liab nyob rau hauv acidic tej yam kev mob thiab liab ntawv litmus hloov xiav nyob rau hauv tej yam kev mob los yog alkaline, nrog rau xim hloov tshwm sim tshaj pH ntau yam 4.5-8.3 ntawm 25 ° C (77 ° F). Nruab nrab ntawv litmus yog ntshav. Piv txwv li, ammonia gas, uas yog alkaline, tig liab ntawv litmus xiav.
Tsis tas li ntawd, vim li cas cov kua qaub hloov xim ntawm litmus ntawv? Nws yog vim 7-hydroxyphenoxazone. Thaum raug kua qaub hauv qab pH 4.5, lub molecule zoo li cov duab hauv qab no thiab qhov no muab ntawv litmus nws red xim . Lub xub ntiag ntawm kua qaub ua rau litmus tig liab thaum muaj lub hauv paus (alkali) tig litmus xiav.
Ntawm no, pH ntawv hloov xim li cas?
Yog vim li cas Xim hloov Qhov no pH ntawv hloov xim nyob rau hauv txawv pH kev daws teeb meem vim yog cov tshuaj flavin, uas yog cov xim muaj nyob rau hauv liab cabbage. Nyob rau hauv lub xub ntiag ntawm ib tug acidic tov, nws tig liab. Nyob rau hauv lub xub ntiag ntawm ib tug yooj yim tov, nws puv greenish.
Dab tsi ua rau cov ntsuas hloov xim?
Cov xim hloov ib pH qhov taw qhia yog ua rau los ntawm dissociation ntawm H+ ion los ntawm qhov taw qhia nws tus kheej. Nco qab tias pH ntsuas tsis tsuas yog ntuj dyes tab sis kuj tsis muaj zog acids. Lub dissociation ntawm qaug zog acid qhov taw qhia ua rau kev daws rau hloov xim.
Pom zoo:
Vim li cas qhov kev tawg ntawm daim ntawv thiab hlawv cov ntawv suav tias yog ob hom kev hloov pauv?
Tearing ntawm daim ntawv yog ib qho kev hloov ntawm lub cev vim hais tias thaum daim ntawv torn tsuas yog cov tsos ntawm daim ntawv hloov thiab tsis muaj cov khoom tshiab tsim. tearing ntawm daim ntawv yog ib qho kev hloov ntawm lub cev vim nws tseem zoo li qub tab sis qhov kub ntawm daim ntawv yog ib qho tshuaj hloov vim nws hloov mus rau hauv tshauv
Txoj kev faib cov ntaub ntawv twg muab cov ntaub ntawv sib npaug ntawm cov ntaub ntawv lossis cov kev tshuaj xyuas hauv txhua chav kawm cov ntaub ntawv?
Quantile. txhua chav kawm muaj cov yam ntxwv sib npaug. Ib qho kev faib tawm ntau yog zoo haum rau cov ntaub ntawv faib tawm. Quantile muab tib tus lej ntawm cov ntaub ntawv muaj nuj nqis rau txhua chav kawm
Cov xim dab tsi yog cov hlwb feem ntau ua ntej siv thawj cov xim rau cov txheej txheem Gram stain?
Ua ntej, siv lead ua violet, thawj stain, yog siv rau lub tshav kub-tso smear, muab tag nrho cov hlwb xim liab
Qhov piv txwv ntawm kev hloov xim yog dab tsi?
Xim hloov ntawm xiav mus rau lub teeb ntsuab. Tooj liab reacts nrog oxygen, H2O thiab CO2 muab tooj liab carbonate, uas hloov xim ntawm xim av mus rau xiav los yog xiav ntsuab. Rusting, blackening ntawm qhov chaw ntawm txiav zaub thiab txiv hmab txiv ntoo yog lwm yam piv txwv ntawm kev hloov ntawm cov xim nyob rau hauv ib tug tshuaj tiv thaiv
Koj pom li cas pH ntawm litmus ntawv?
Kev kuaj litmus yog ua los ntawm kev tso ib qho me me ntawm cov qauv rau ntawm daim ntawv xim. Feem ntau, litmuspaper yog xim liab lossis xiav. Daim ntawv liab hloov xiav thaum pH yog alkaline, thaum daim ntawv xiav hloov liab thaum pH hloov acidic