Cov neeg, nyob ntawm seb lawv hom haujlwm tshaj li cas, yuav tsum tau daws cov kev daws teeb meem uas muaj cov ntsiab lus nruj me ntsis ntawm cov solute hauv lawv: kev npaj cov tshuaj daws teeb meem, yaj ib qho kev tsim tawm rau cov duab, kev daws teeb meem rau lub roj teeb muaj sulfuric acid, thiab lwm yam. Yog li ntawd, hauv kev qhia txog chemistry, siv cov haujlwm, cov tub ntxhais kawm kawm los kawm kev xam qhov loj ntawm qhov sib tov - qhov sib piv ntawm qhov loj ntawm ib mus rau ib qho loj ntawm qhov tov.
Cov Lus Qhia
Kauj ruam 1
Nyeem cov teeb meem kom zoo. Sau luv luv, nyob rau sab laug ntawm nplooj ntawv, sau cov ntsiab lus siv cov cim cim tsiaj ntawv thiab cov qauv tshuaj, yog tias muaj. Kev txiav txim los ntawm cov lus nug ua haujlwm yuav tsum pom dab tsi.
Kauj ruam 2
Sau rau ntawm nplooj ntawv sab xis ntawm cov qauv mis rau huab hwm coj loj ntawm cov solute
= m1 / m, qhov twg m1 yog qhov loj ntawm solute, thiab m yog qhov loj ntawm tag nrho cov tshuaj.
Yog tias koj xav paub cov ntsiab lus ntawm cov feem loj ntawm cov solute ua feem pua, muab cov tawm los ntawm 100%:
ω = m1 / m х 100%
Kauj ruam 3
Hauv cov haujlwm uas koj yuav tsum xam cov zauv feem ntawm txhua yam ntawm cov tshuaj uas ua kom muaj khes mis, siv lub rooj ntawm D. I. Mendeleev. Piv txwv li, nrhiav cov zauv feem ntawm txhua yam ntawm cov ntsiab lus uas ua los ntawm cov hydrocarbon, cov qauv uas yog C6H12
m (C6H12) = 6 x 12 + 12 x 1 = 84 g / mol
ω (C) = 6 m1 (C) / m (C6H12) x 100% = 6 x 12 g / 84 g / mol x 100% = 85%
ω (H) = 12 m1 (H) / m (C6H12) x 100% = 12 x 1 g / 84 g / mol x 100% = 15%
Kauj ruam 4
Sau cov lus teb rau qhov teeb meem.
