Qhov sib txawv tseem ceeb ntawm phenolphthalein alkalinity thiab tag nrho alkalinity yog tias phenolphthalein alkalinity ntsuas hydroxides thiab ib nrab ntawm cov carbonates ntawm pH ntawm 8.3, whereas tag nrho alkalinity ntsuas tag nrho cov carbonates, bicarbonate, thiab hydroxide alkalinity ntawm 5 pH ntawm 4.
Alkalinity ntsuas tus nqi ntawm cov kua qaub uas yuav tsum tau ua kom tsis txhob cuam tshuam tag nrho cov ntsiab lus hauv ib qho piv txwv. Muaj ntau hom alkalinity, thiab phenolphthalein thiab tag nrho alkalinity yog ob ntawm lawv.
YPhenolphthalein Alkalinity yog dab tsi?
Phenolphthalein alkalinity tuaj yeem piav qhia raws li alkalinity hauv cov qauv dej ntsuas los ntawm tus qauv acid uas yuav tsum tau txo qis pH mus rau qib 8.3. Tus nqi pH no yog qhia los ntawm kev hloov xim ntawm phenolphthalein los ntawm liab mus rau xim tsis muaj xim.
Feem ntau, carbonate, hydrogen carbonate, thiab hydroxide ions hauv dej tuaj yeem ua rau alkalinity hauv dej. Phenolphthalein alkalinity feem ntau ntsuas hydroxides thiab ib nrab ntawm cov carbonates. Qhov no sib raug mus rau qhov kawg ntawm qhov ntsuas phenolphthalein peb tuaj yeem siv rau hauv kev txiav txim siab ntawm alkalinity. Peb tuaj yeem nthuav qhia phenolphthalein alkalinity nyob rau hauv cov nqe lus ntawm milligrams ib liter ntawm sib npaug rau calcium carbonate.
Y Yuav tsum hais, phenolphthalein yog ib hom alkalinity. Peb tuaj yeem txiav txim siab nws los ntawm titrating nws mus rau pH 8.3. Piv txwv li, yog tias peb tab tom titrating OH- ions nrog cov kua qaub uas muaj zog, qhov no ua rau peb muaj titration nkhaus qhia qhov sib npaug. Hauv qhov nkhaus, peb tuaj yeem pom qhov taw tes uas tag nrho OH- ions tau nruab nrab ntawm phenolphthalein kawg. Tab sis, yog hais tias peb tab tom titrating carbonate ions nrog ib tug muaj zog acid, nws muab lub phenolphthalein kawg point ntawm uas tsuas yog ib nrab ntawm cov carbonate ions yog neutralized vim carbonate yog ib hom tshuaj dibasic. Yog li, phenolphthalein alkalinity tuaj yeem muab rau peb tag nrho qib hydroxide thiab ib nrab ntawm qib carbonate.
tag nrho Alkalinity yog dab tsi?
Tag nrho alkalinity yog cov dej muaj peev xwm tiv thaiv kev hloov pauv hauv pH. Hauv lwm lo lus, nws yog qhov ntsuas ntawm tag nrho cov concentration ntawm txhua hom alkaline yaj hauv dej. Lub hauv paus ntsiab lus alkaline hom muaj xws li hydroxide ions, carbonate, thiab bicarbonate ions. Cov ions no tuaj yeem cuam tshuam cov pH ntawm dej los ntawm neutralizing acids; Yog vim li cas peb thiaj hais tau tias tag nrho cov alkalinity yog lub peev xwm ntawm cov dej los tiv thaiv kev hloov hauv pH.
Ntxiv mus, cov kws tshuaj hauv dej siv cov ntsuas milligrams ib liter ntawm calcium carbonate (mg / L CaCO3) los ntsuas qhov ntsuas no. Los yog lwm yam, peb tsuas tuaj yeem siv chav tsev ppm (qhov ib lab). Qhov zoo tshaj plaws ntawm qhov ntsuas no rau cov dej zoo yog 80-120 ppm.
Qhov txawv ntawm Phenolphthalein Alkalinity thiab Tag Nrho Alkalinity yog dab tsi?
Phenolphthalein alkalinity thiab tag nrho alkalinity yog cov ntaub ntawv tshwj xeeb ntawm alkalinity. Cov no tseem ceeb heev hauv kev txiav txim siab alkaline qib dej. Qhov sib txawv tseem ceeb ntawm phenolphthalein alkalinity thiab tag nrho alkalinity yog tias phenolphthalein alkalinity ntsuas hydroxides thiab ib nrab ntawm cov carbonates ntawm pH ntawm 8.3, whereas tag nrho alkalinity ntsuas tag nrho cov carbonates, bicarbonate, thiab hydroxide alkalinity ntawm pH4.5.
Cov lus hauv qab no qhia txog qhov sib txawv ntawm phenolphthalein alkalinity thiab tag nrho alkalinity.
Summary – Phenolphthalein Alkalinity vs Total Alkalinity
Phenolphthalein alkalinity yog alkalinity hauv cov qauv dej ntsuas los ntawm tus qauv acid uas yuav tsum tau txo qis pH mus rau qib 8.3. Tag nrho alkalinity yog dej lub peev xwm los tiv thaiv kev hloov hauv pH. Qhov sib txawv tseem ceeb ntawm phenolphthalein alkalinity thiab tag nrho alkalinity yog tias phenolphthalein alkalinity ntsuas hydroxides thiab ib nrab ntawm cov carbonates ntawm pH ntawm 8.3, whereas tag nrho alkalinity ntsuas tag nrho cov carbonates, bicarbonate, thiab hydroxide alkalinity ntawm pH ntawm 4.5.
