Phenolphthalein, CAS No. 77-09-8, tshuaj muaj npe 3,3-bis(4-hydroxyphenyl)-3H-isobenzofuranone, yog cov organic compound nrog cov tshuaj formula C20H14O4. Nws yog xim dawb rau me ntsis daj crystalline hmoov, soluble hauv ethanol thiab alkaline daws, me ntsis soluble hauv ether, me ntsis soluble hauv chloroform, thiab insoluble hauv dej. Nws cov yam ntxwv feature yog tias nws tsis muaj xim nyob rau hauv acidic thiab nruab nrab cov ntsiab lus thiab hloov ntshav-liab hauv alkaline daws. Nws yog feem ntau siv los ua tus ntsuas acid-base.
Phenolphthalein yog ib qho stimulant siv rau cem quav ntev. Nws ncaj qha nkoos lub plab hnyuv mucosa los yog activates cov hlab ntsha xaus nyob rau hauv lub du nqaij ntawm txoj hnyuv, ua rau plab hnyuv propulsion. Txawm li cas los xij, cov nyhuv laxative ntau dhau tuaj yeem ua rau cov kua dej thiab electrolyte tsis txaus. Kev siv sijhawm ntev - tuaj yeem ua rau lub paj hlwb puas, uas tuaj yeem hloov tsis tau.
Product Specifications thiab Properties
- Cov roj formula: C20H14O4;
- Molecular Luj: 318.323;
- Melting Point: 258 rau 263 degree;
- Qhov ceev: 1.299 g / cm³;
- Purity: 99%;
- Qhov tsos: Dawb hmoov;
- Txoj Kev Tshawb Nrhiav: Kev Qhia Ua Haujlwm Siab (HPLC) Spectroscopy;
- Txheem: USP (United States Patent and Trademark Office)
Cov khoom siv
Phenolphthalein yog cov organic acid tsis muaj zog. Hauv kev daws teeb meem nrog pH <8.2, nws tshwm sim raws li cov qauv tsis muaj xim lactone; thaum pH> 8.2, nws tshwm sim raws li cov qauv quinone liab.
Cov xim hloov pauv ntawm phenolphthalein yog 8.2-10.0, yog li phenolphthalein tsuas tuaj yeem ntes cov hauv paus, tsis yog acids.
Daim ntawv quinone lossis quinone ntsev ntawm phenolphthalein tsis ruaj khov hauv alkaline xov xwm, maj mam hloov mus rau ib daim ntawv tsis muaj xim carboxylate; Thaum sib cuag nrog cov ntsiab lus alkaline, nws tam sim ntawd hloov mus rau ib daim ntawv tsis muaj xim carboxylate. Yog li ntawd, thaum phenolphthalein reagent ntxiv rau cov tshuaj alkaline concentrated, phenolphthalein pib liab, uas sai sai ploj mus rau xim tsis muaj xim.
Phenolphthalein yog ib qho dawb los yog daj me ntsis zoo siv lead ua, sparingly soluble nyob rau hauv dej tab sis yooj yim soluble hauv cawv. Yog li ntawd, phenolphthalein feem ntau yog npaj ua ib qho dej cawv. Thaum phenolphthalein reagent ntxiv rau hauv dej los yog nruab nrab / acidic aqueous daws, qhov dawb turbidity yuav tshwm. Qhov no yog vim cawv yog miscible nrog dej nyob rau hauv ib qho kev faib ua feem, ua rau cov dej -insoluble phenolphthalein nyob rau hauv lub reagent kom precipitate.
Cov kev siv tseem ceeb ntawm phenolphthalein muaj xws li:
- Kev lag luam kws tshuaj: Cov khoom siv tshuaj; ib tug me me laxative uas txhawb lub plab hnyuv phab ntsa, ua rau plab hnyuv peristalsis thiab txhawb defecation . 1. Haum rau cov cwj pwm tsis zoo thiab intractable cem quav, muaj nyob rau hauv cov ntsiav tshuaj, suppositories, thiab lwm yam tshuaj;
- Siv nyob rau hauv cov organic synthesis: Feem ntau siv nyob rau hauv synthesis ntawm plastics, tshwj xeeb tshaj yog diazanaphthyl ketone (DATA) polyaryletherketone (PAK) polymers. Cov polymers no muaj cov cua sov ua haujlwm zoo, dej tsis kam, tshuaj tiv thaiv corrosion, kub laus tiv thaiv, thiab kev ua haujlwm zoo. Fibers, coatings, thiab cov ntaub ntawv sib xyaw ua los ntawm lawv yog dav siv hauv electronics, machinery, tsheb thauj mus los, aerospace, nuclear engineering, thiab tub rog teb;
Vim li cas thiaj xaiv peb
Peb muab thawj- tes; lav kev sib tw nqi thiab zoo. Peb tuaj yeem npaj cov khoom xa tuaj rau tib hnub tom qab tso qhov kev txiav txim, ua kom cov khoom zoo thiab kev xa khoom ruaj khov, tso cai rau kev yeej - yeej kev koom tes.
