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Video: Koj ua li cas xam cov teeb meem titration?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Titration Problem Step-by-Step Solution
- Kauj Ruam 1: Txiav txim siab [OH-] Txhua mole ntawm NaOH yuav muaj ib mole ntawm OH-.
- Kauj Ruam 2: Txiav txim seb tus naj npawb ntawm moles ntawm OH- Molarity = tus naj npawb ntawm moles/volume.
- Kauj Ruam 3: Txiav txim seb tus naj npawb ntawm moles ntawm H+
- Kauj Ruam 4: Txiav txim siab qhov concentration ntawm HCl.
Ib yam li ib tug yuav nug, koj ua li cas xam titration?
Siv cov titration qauv. Yog hais tias tus titrant thiab analyte muaj ib tug 1: 1 mole piv, lub mis yog molarity (M) ntawm cov kua qaub x ntim (V) ntawm cov kua qaub = molarity (M) ntawm lub hauv paus x ntim (V) ntawm lub hauv paus. (Molarity yog qhov concentration ntawm cov tshuaj qhia raws li tus naj npawb ntawm moles ntawm solute ib liter ntawm kev daws.)
Ib sab saum toj no, qhov molarity ntawm NaOH yog dab tsi? Piv txwv li, ib tug 0.25 M NaOH tshuaj (qhov no yog nyeem raws li 0.25 molar) muaj 0.25 moles ntawm sodium hydroxide nyob rau hauv txhua liter ntawm kev daws. Txhua lub sij hawm koj pom cov ntawv luv M koj yuav tsum xav tam sim ntawm nws li mol/L.
Ntawm no, koj pom qhov concentration ntawm HCl los ntawm titration nrog NaOH li cas?
Xam qhov concentration ntawm hydrochloric acid
- Kev daws teeb meem ntawm sodium hydroxide = 25.00 ÷ 1000 = 0.0250 dm 3
- Sodium hydroxide = 0.200 × 0.0250 = 0.005 mol.
- Los ntawm qhov sib npaug, 0.005 mol ntawm NaOH reacts nrog 0.005 mol ntawm HCl.
- Hwj chim ntawm hydrochloric acid = 22.70 ÷ 1000 = 0.0227 dm 3
Dab tsi yog qhov taw qhia hauv titration?
Qhov taw qhia : Ib yam khoom uas hloov xim teb rau kev hloov tshuaj. Acid-base qhov taw qhia (piv txwv li, phenolphthalein) hloov xim nyob ntawm pH. Redox ntsuas kuj siv tau. Ib tug poob ntawm qhov taw qhia tov yog ntxiv rau lub titration thaum pib; qhov kawg tau mus txog thaum cov xim hloov.
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