Video: Qhov pH ntawm 7 qhia li cas txog cov khoom?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
pH : Txhais thiab ntsuas ntsuas
pH yog ib qho kev ntsuas ntawm acidic/basic dej. Qhov ntau yog los ntawm 0 txog 14, nrog 7 ua nruab nrab. pH tsawg dua 7 qhia acidity, yog a pH ntawm ntau dua 7 qhia ib base. pH Nws yog ib qho kev ntsuas ntawm qhov txheeb ze ntawm cov dawb hydrogen thiab hydroxyl ions hauv dej
Ua li no, kev sib raug zoo ntawm H + thiab OH ntawm pH ntawm 7 yog dab tsi?
Thaum cov tshuaj yog acidic ([H+] > [ OH -), cov pH tsawg dua 7 . Thaum qhov kev daws teeb meem yog qhov yooj yim ([ OH -] > [H+]), ua pH yog loj dua 7 . Thaum qhov kev daws teeb meem nruab nrab ([H+] = [ OH -]), ua pH yog 7 . (Kev daws teeb meem nrog pH nruab nrab 6 thiab 8 feem ntau suav hais tias yog qhov nruab nrab.)
Tsis tas li ntawd, koj yuav ntxiv dab tsi rau kev daws nrog pH ntawm 1.5 kom tau txais kev daws nrog PH ntawm 7? Yog ib daws muaj ib pH ntawm 1.5 Nws yog acid, txhais tau hais tias nws muaj ntau H + ions dua OH- ions. A daws nrog pH = 7 yog nruab nrab. Nws muaj qhov sib npaug ntawm H + thiab OH- ions. Txhawm rau neutralize cov kua qaub, koj yuav xav tau ntxiv base, uas yog a daws nrog ntau tshaj ntawm OH-ions.
Ntawm no, vim li cas 7 nruab nrab ntawm pH nplai?
pH yog ib qho kev ntsuas ntawm tus nqi ntawm Hydrogen ions (H +) hauv kev daws. Txawm tias nyob rau hauv cov dej ntshiab ions zoo li tsim vim cov txheej txheem random (tsim ib co H + thiab OH- ions). Tus nqi ntawm H + uas tau ua hauv dej ntshiab yog kwv yees li a pH ntawm 7 . Yog vim li cas 7 yog nruab nrab.
Yam khoom twg muaj pH siab tshaj?
Qhov ntsuas pH
| Nce pH (Tsawg Acidity) | Tshuaj |
|---|---|
| 0 (feem ntau acidic) | Hydrochloric acid (HCl) |
| 1 | Lub plab acid |
| 2 | Txiv qaub kua txiv |
| 3 | Cola, npias, vinegar |
Pom zoo:
Dab tsi yog qhov me me ntawm cov khoom uas khaws cov khoom ntawm lub caij?
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Daim duab qhia lub cev dawb qhia koj li cas txog lub zog net ntawm ib qho khoom?
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