Video: KW pH yog dab tsi?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Ua ntej sib tham pH peb yuav tsum nkag siab txog tus cwj pwm sib npaug ntawm cov dej. Lub equilibrium tsis tu ncua, Kw , yog hu ua dissociation tas li los yog ionization tas li ntawm dej. Hauv dej ntshiab [H+] = [OH-] = 1.00x10-7 M. pH thiab pOH. Ua hauj lwm nrog cov lej xws li 1.00x10-7 M los piav txog qhov kev daws teeb meem nruab nrab yog qhov tsis txaus ntseeg.
Ib yam li ib tug yuav nug, tus nqi ntawm KW ntawm 25 C yog dab tsi?
Cov tus nqi Kw ntawm 25 Celsius yog tshwj xeeb 1 × 10 − 14 1 × 10 − 14. Kw yog ib qho piv txwv ntawm qhov sib npaug.
Tsis tas li ntawd, pH txhais li cas? pH yog ib qho kev ntsuas ntawm hydrogen ion concentration, ntsuas ntawm acidity los yog alkalinity ntawm cov kua. Cov pH scale feem ntau yog nyob ntawm 0 txog 14. Aqueous daws ntawm 25 ° C nrog a pH tsawg dua 7 yog acidic, thaum cov uas muaj a pH ntau dua 7 yog qhov yooj yim lossis alkaline.
Tsis tas li ntawd, kuv yuav xam pH li cas?
Rau xam tus pH ntawm cov kua dej aqueous koj yuav tsum paub qhov concentration ntawm hydronium ion hauv moles ib liter (molarity). Cov pH Tom qab ntawd suav nrog kev qhia: pH = - log [H3O+].
Dab tsi yog pH ntawm dej ntshiab?
Cov pH ntawm dej ntshiab yog 7. Feem ntau, dej nrog a pH qis dua 7 yog suav tias yog acidic, thiab nrog a pH ntau dua 7 yog suav tias yog qhov yooj yim. Qhov ib txwm muaj rau pH hauv nto dej systems yog 6.5 rau 8.5, thiab cov pH Qhov nruab nrab ntawm cov dej hauv av yog nruab nrab ntawm 6 txog 8.5.
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