Hoobkas Kua Glacial Acetic Acid 99.9% hauv Kev Muab Khoom Loj
Peb muaj cov khoom siv niaj hnub. Peb cov khoom raug xa tawm mus rau Tebchaws Meskas, UK thiab lwm yam, txaus siab rau qhov xwm txheej zoo heev ntawm cov neeg siv khoom rau Hoobkas Kua Glacial Acetic Acid 99.9% hauv Kev Muab Khoom Loj, Peb yuav ua peb qhov zoo tshaj plaws kom ua tau raws li lossis tshaj cov neeg siv khoom cov lus qhia nrog cov kev daws teeb meem zoo tshaj plaws, lub tswv yim siab heev, thiab cov neeg muab kev pabcuam zoo thiab raws sijhawm. Peb txais tos txhua tus neeg yuav khoom.
Peb muaj cov khoom siv niaj hnub. Peb cov khoom raug xa tawm mus rau Tebchaws Meskas, UK thiab lwm yam, txaus siab rau qhov xwm txheej zoo heev ntawm cov neeg siv khoom rau, Kev muag peb cov kev daws teeb meem tsis ua rau muaj kev pheej hmoo thiab coj cov nyiaj rov qab siab rau koj lub tuam txhab hloov chaw. Nws yog peb txoj kev nrhiav tas li los tsim kom muaj txiaj ntsig rau cov neeg siv khoom. Peb lub tuam txhab tab tom nrhiav cov neeg sawv cev ua tsaug. Koj tos dab tsi? Los koom nrog peb. Tam sim no lossis tsis txhob.
Cov Kua Glacial Acetic Acid Cov Ntsiab Lus
Lub Ntsiab Cai: Kev ntsuas qhov tsis sib xws nrog cov tshuaj sodium hydroxide siv phenolphthalein ua tus qhia. Cov ntsiab lus ntawm cov kua qaub formic raug rho tawm hauv kev xam.
Cov tshuaj reagents thiab cov tshuaj daws teeb meem:
Cov tshuaj sodium hydroxide txheem: c(NaOH) = 1 mol/L.
Phenolphthalein qhia: 5 g/L ethanol kua. Yaj 0.5 g phenolphthalein rau hauv 100 ml ntawm 95% (V/V) ethanol thiab neutralize nrog 4 g/L sodium hydroxide kua kom txog thaum muaj xim liab me ntsis tshwm sim.
Khoom Siv: Lub raj mis ntsuas qhov hnyav conical (muaj peev xwm 3 ml); alkaline burette (muaj peev xwm 50 ml). Kua Glacial Acetic Acid.
Txheej Txheem: Ntsuas kwv yees li 2.5 g ntawm cov qauv hauv lub raj mis conical, kom raug txog 0.0001 g. Muab lub raj mis tso rau hauv lub raj mis conical 250 ml uas muaj 50 ml dej tsis muaj carbon dioxide. Qhib lub hau raj mis, ntxiv 0.5 ml ntawm phenolphthalein indicator, thiab titrate nrog sodium hydroxide standard solution kom txog thaum nws tseem muaj xim liab dawb li 5 vib nas this.
