Video: Xim ntawm pH 7 yog dab tsi?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Universal ntsuas
| pH ntau | Kev piav qhia | Xim |
|---|---|---|
| 3–6 | Tsis muaj kua qaub | Txiv kab ntxwv los yog daj |
| 7 | Nruab nrab | Ntsuab |
| 8–11 | Tsis muaj zog alkali | Xiav |
| > 11 | Muaj zog alkali | Violet los yog Indigo |
Ib yam li ntawd, cov xim ntawm pH nplai yog dab tsi?
Cov pH ntsuas khiav ntawm 0 mus rau 14, nrog rau txhua tus lej muab qhov sib txawv xim . Hauv qab ntawm lub nplai zaum liab, uas sawv cev rau cov acidic tshaj plaws, thiab xiav tsaus ntawm nws qhov opposite kawg sawv cev rau 14 thiab alkalinity. Nyob rau hauv nruab nrab cheeb tsam, lub pH ntsuas ua nruab nrab. Mis muaj ib pH ntawm 6 thiab ib tug nruab nrab off-dawb xim.
Ib yam li ntawd, qhov ntsuas pH zoo tshaj plaws yog dab tsi? Qee cov cuab yeej kuaj pH siv dav tshaj plaws yog pH ntsuas, suav nrog phenolphthalein (ntau pH 8.2 txog 10.0; tsis muaj xim rau liab), bromthymol xiav (ntau pH 6.0 txog 7.6; daj rau xiav), thiab litmus (ntau pH 4.5 txog 8.3; liab rau xiav).
Raws li txoj cai, pH nplai yog qhov ntsuas thoob ntiaj teb?
pH ntsuas yog qhov ntau ntawm cov lej muab los ntawm kev ua haujlwm tawm -log[H +] rau kev daws teeb meem. Nws txawv ntawm 14 mus txog -2. Universal ntsuas yog ib qho kev sib xyaw ntawm cov kev daws teeb meem uas hloov xim nyob ntawm qhov tus nqi ntawm pH . Liab qhia pH mus txog 2-4, txiv kab ntxwv los ntawm 3-6, ntsuab qhov twg pH = 7, xiav rau 8–11 thiab ntshav rau 11–14.
Dab tsi yog xim ntawm HCl ntawm pH ntawv?
Ntau cov yeeb yaj kiab hauv YouTube
| Daim ntawv lo | Kev daws | Xim hloov hauv pH ntawv |
|---|---|---|
| A | Dilute HCl | Liab |
| B | Dilute NaOH kua | Ntshav |
| C | Dilute ethanoic acid daws | Daj |
| D | Txiv qaub kua txiv | Txiv kab ntxwv |
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