Dab tsi yog qhov zoo feem pua rov qab rau recrystallization?

Video: Dab tsi yog qhov zoo feem pua rov qab rau recrystallization?

2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36

Raws li wikipedia, ib txwm muaj tawm los ntawm dej kub recrystallization ntawm benzoic acid yog 65%, txawm hais tias nyob rau hauv zoo tagnrho tej yam kev mob. Raws li qhov ntawd, a rov qab los ntawm 54% yog ncaj ncees zoo , tshwj xeeb tshaj yog tias qhov ntawd yog koj thawj zaug sim.

Ntxiv mus, dab tsi yog qhov feem pua rov qab nyob rau hauv recrystallization?

Feem pua rov qab = tus nqi ntawm cov khoom koj tau sau tau / tus nqi ntawm cov khoom koj yuav tsum tau sau, raws li a feem pua . Yog li lwm txoj hauv kev muab nws: Feem pua rov qab = (pure/impure) x 100. Wb hais tias koj muaj 10.0g ntawm cov khoom tsis huv thiab tom qab recrystallization koj tau sau 7.0 g ntawm cov khoom ntshiab qhuav.

Tom qab ntawd, lo lus nug yog, dab tsi yog qhov kev lees txais feem pua rov qab? Kev lees txais rov qab nyob ntawm qhov concentration thiab lub hom phiaj ntawm koj qhov kev txheeb xyuas. Piv txwv li, 10 µg / kg (ppb) lees txais rov qab = 70-125%, thiab 10 μg / g (ppm) lees txais rov qab =80-115%. Kev lees txais rov qab yuav tsum muaj ze li ntawm 100% thaum koj qhov concentration siab dua.

Ib yam li ntawd, dab tsi yog qhov txiaj ntsig zoo rau recrystallization?

Raws li Vogel's Textbook of Practical Organic Chemistry, tawm los ze rau 100% yog hu ua quantitative, tawm los saum 90% yog hu ua zoo heev, tawm los tshaj 80% yog heev zoo , tawm los tshaj 70% yog zoo , tawm los saum 50% yog ncaj ncees, thiab tawm los qis dua 40% hu ua neeg pluag.

Vim li cas feem pua rov qab qis dua hauv recrystallization?

Yog tias koj siv cov kuab tshuaj ntau dhau, tsawg dua ntawm cov khoom sib xyaw uas koj tab tom sim ua kom huv si recrystallizes (ntau ntxiv hauv cov tshuaj), thiab koj yuav tau txais tsawg feem pua rov qab . Lub purity yuav txo thiab cov feem pua yield yuav nce me ntsis. Kev ua kom txias qeeb qeeb yuav muab cov muaju ntshiab ntau dua.

Pom zoo:

Qhov feem ntawm 33 1 3 feem pua yog dab tsi?

Piv txwv tus nqi feem pua ntawm cov zauv feem 25% 0.25 1/4 331/3% 0.333 1/3 50% 0.5 1/2 75% 0.75 3/4

Qhov feem pua yield zoo yog dab tsi?

Feem ntau cov tshuaj tiv thaiv yog muab qhov feem pua siab tshaj tawm los; raws li lub npe qhia, qhov no yog qhov feem pua siab tshaj plaws ntawm cov khoom siv theoretical uas tuaj yeem xyaum tau. Cov tshuaj tiv thaiv tawm los ntawm 90% ntawm cov theoretical tau yuav suav hais tias zoo heev. 80% yuav zoo heev. Txawm tias ib qho txiaj ntsig ntawm 50% yog suav tias tsim nyog

Qhov feem pua ntawm qhov loj ntawm BR hauv CuBr2 yog dab tsi?

Cov feem pua ntawm cov ntsiab lus Element Symbol Mass Percent Copper Cu 28.451% Bromine Br 71.549%

Dab tsi yog qhov feem pua enantiomeric tshaj ntawm qhov sib tov uas muaj 86?

Enantiomeric tshaj (ee): Qhov ntau tshaj ntawm ib qho enantiomer tshaj qhov sib tov ntawm enantiomers. Qhia lej: enantiomeric tshaj = % ntawm cov enantiomer loj - % ntawm cov me me enantiomer. Piv txwv li: Ib qho kev sib xyaw ua ke ntawm 86% R enantiomer thiab 14% S enantiomer muaj 86% - 14% = 72% ee