Qhov sib txawv tseem ceeb ntawm thawj thiab theem nrab cov qauv kev daws teeb meem yog qhov kev daws teeb meem thawj zaug muaj qhov purity siab thiab tsis tshua muaj tshwm sim thaum cov tshuaj thib ob muaj tsawg dua purity thiab siab reactivity.
Standardization yog tus txheej txheem ntawm kev nrhiav qhov tseeb concentration ntawm kev npaj tshuaj siv tus txheej txheem daws raws li qhov siv. Cov txheej txheem kev daws teeb meem tau paub meej cov concentrations thiab peb npaj cov kev daws teeb meem no siv cov qauv tshuaj. Ob daim qauv kev daws teeb meem loj yog cov qauv thawj thiab cov qauv thib ob. Peb siv cov qauv tseem ceeb rau kev tsim cov qauv kev daws teeb meem thib ob. Cov qauv thib ob muaj txiaj ntsig zoo rau kev sim tshuaj ntsuam tshwj xeeb.
Primary Standard Solution yog dab tsi?
Primary standard solutions the solutions made form the first standard substances. Cov tshuaj no muaj purity siab uas ze li ntawm 99.9% purity. Peb muaj peev xwm yaj cov tshuaj no nyob rau hauv ib tug paub ntim ntawm cov kuab tshuaj nyob rau hauv thiaj li yuav tau txais cov thawj txheej txheem tov. Cov kev daws teeb meem no tuaj yeem cuam tshuam txog tshuaj lom neeg. Yog li ntawd, peb tuaj yeem siv cov tshuaj reagent no los txiav txim siab qhov tsis paub txog qhov kev daws teeb meem uas dhau los ntawm cov tshuaj tiv thaiv tshwj xeeb.
Cov kev daws teeb meem no muaj cov tshuaj lom neeg thiab lub cev. Piv txwv li, cov kev daws teeb meem no muaj purity siab thiab ruaj khov heev. Nyob rau hauv titration, peb yuav tsum standardize tag nrho cov kev daws peb siv rau titration ua ntej ua qhov kev sim. Qhov no yog vim hais tias, txawm tias peb siv cov khoom siv tiag tiag los ua cov kev daws teeb meem no, lawv yuav tsis muaj qhov tseeb uas peb xav tau vim tias cov tshuaj tsis huv ntau npaum li ntawd. Qee qhov piv txwv ntawm cov qauv tseem ceeb suav nrog potassium bromate (KBrO3), sodium chloride, zinc hmoov, thiab lwm yam.
Tus Txheej Txheem Thib Ob yog dab tsi?
Cov qauv kev daws teeb meem thib ob yog cov kev daws teeb meem los ntawm cov txheej txheem thib ob. Peb npaj cov kev daws teeb meem no rau kev sim tshuaj ntsuam xyuas tshwj xeeb. Peb yuav tsum txiav txim siab qhov concentration ntawm cov kev daws teeb meem no siv cov qauv tseem ceeb. Feem ntau, cov kev daws teeb meem no muaj txiaj ntsig zoo rau kev ntsuas ntsuas ntsuas ntsuas.
Daim duab 01: Potassium Permanganate
Txawm li cas los xij, qhov purity ntawm cov kev daws teeb meem no tsawg dua piv rau cov qauv tseem ceeb thiab cov kev ua haujlwm siab. Vim yog qhov reactivity siab, cov kev daws teeb meem no tau kis tau yooj yim. Qee qhov piv txwv yog anhydrous sodium hydroxide thiab potassium permanganate. Cov tshuaj no yog hygroscopic.
Qhov txawv ntawm qhov kev daws teeb meem thawj zaug thiab theem nrab yog dab tsi?
Primary standard solution is the solution made form the first standard substances. Nws muaj lub siab purity thiab qis reactivity. Cov kev daws teeb meem thib ob yog cov kev daws teeb meem los ntawm cov txheej txheem thib ob. Cov no yog cov ntshiab ntshiab thiab reactive heev. Qhov no yog qhov sib txawv tseem ceeb ntawm kev daws teeb meem thawj thiab theem nrab. Tsis tas li ntawd, vim lawv qhov tsis tshua muaj tshwm sim, cov txheej txheem kev daws teeb meem tsis tshua muaj paug thaum cov txheej txheem theem nrab cov kev daws teeb meem yog cov reactive heev, lawv yooj yim kis tau. Yog li ntawd, peb yuav tsum tsim cov qauv kev daws teeb meem thib ob ua ntej siv.
Summary – Thawj thiab Secondary Standard Solution
qauv kev daws teeb meem yog qhov tseem ceeb hauv kev txiav txim siab qhov tsis paub txog qhov kev sim daws teeb meem. Muaj ob daim ntawv ua qauv thawj thiab cov qauv thib ob. Qhov sib txawv ntawm thawj thiab theem nrab cov qauv kev daws teeb meem yog tias cov txheej txheem kev daws teeb meem tseem ceeb muaj qhov purity siab thiab tsis tshua muaj tshwm sim thaum cov kev daws teeb meem theem nrab muaj qhov tsis huv tsawg dua thiab muaj kev ua haujlwm siab.
