Acidity meter (ph meter) ntsuas ceev faj
(1) Ua ntej ntsuas, ntsuas ntsuas, cov qauv kev daws teeb meem thiab cov kua yuav tsum tau muab tso rau hauv chav kuaj ua ntej. Rau potentiometers siab dua qib 0.01, lawv yuav tsum ua haujlwm ntawm chav tsev kub ntawm 18 txog 22 degree .
(2) Lub ntsuas ntsuas yuav tsum tau muab ntxuav thiab cov electrode yuav tsum tau muab tso rau hauv dej distilled rau ntau tshaj 24 teev ua ntej ntsuas.
(3) Ua ntej ntsuas ob txoj kev daws teeb meem thiab ua ntej txhua qhov kev siv ntsuas, nco ntsoov yaug cov tshuaj seem ntawm cov electrode kom tsis txhob muaj kab mob hauv cov txheej txheem tom ntej. Tom qab yaug cov electrode, siv cov ntawv lim kom nqus cov dej distilled seem ntawm cov electrode. Tsis txhob so kom qhuav kom tsis txhob puas cov electrodes.
(4) Thaum ntsuas, ntsuas ntsuas thiab ntsuas ntsuas kub yuav tsum tau muab tso rau hauv cov tshuaj uas ntsuas thiab khaws cia rau lub sijhawm kom txog thaum tus nqi ruaj khov ua ntej nyeem ntawv. Lub hauv paus ntsiab lus thiab kev saib xyuas ntawm acidometer (ph meter) Acidometer yog dav siv hauv kev lag luam thiab kev ua liaj ua teb, kev tiv thaiv ib puag ncig, kev tshawb fawb zaub mov thiab lwm yam kev tshawb fawb. Acidity qhia raws li tus nqi pH yog ib qho tseem ceeb ntawm lub cev thiab cov khoom siv tshuaj lom neeg. Nws yog tsuas yog siv los ntsuas pH tus nqi thiab ntsuas electrode (mV} tus nqi ntawm ntau yam kev daws teeb meem. Tsis tas li ntawd, kev ntsuas pH kuj tau siv dav hauv kev tshuaj lom neeg thiab kev kho mob ib puag ncig thiab kev tshawb fawb hauv hiav txwv, yog li kev ua haujlwm ntawm acidimeter ncaj qha cuam tshuam rau kev ntsuas qhov tseeb. tsom xam.
Nyob rau hauv lub aqueous tov ntawm tej yam khoom, muaj ib tug interdependent thiab kev sib nrig sib kev sib raug zoo ntawm ions. Lub pH ntawm kev daws tuaj yeem txiav txim siab los ntawm ions thiab ion concentration hauv cov tshuaj. Sorewsen (Sorewsen. SP L) thawj zaug tau thov kom nthuav tawm cov kua qaub ntawm cov tshuaj hauv xyoo 1909, thiab hu ua tus nqi no tus nqi pH. Qhia tawm raws li: pH=pH yog ib qho kev ntsuas ntawm hydrogen ionization kev ua hauv cov tshuaj. Lub ntsiab lus ntawm tus nqi pH yog: qhov twg: yog qhov teev cov dej num hydrogen ion (mass molar scale); yog qhov loj molar concentration ntawm hydrogen ions, mol / kg; yog qhov kev ua haujlwm coefficient ntawm hydrogen ions. SA Arrhenius tau npaj rau xyoo 1887 tias txhua yam khoom uas tsim cov hydrogen ions hauv cov tshuaj aqueous hu ua acid, thiab cov khoom uas tsim cov hydroxide ions hauv cov tshuaj aqueous hu ua lub hauv paus.
Feem ntau peb siv tus nqi pH los qhia txog acidity thiab alkalinity ntawm cov tshuaj me me: thaum pH=7, cov tshuaj yog nruab nrab, thaum pH <7, nws yog acidic, thiab thaum pH> 7, nws yog alkaline. Xaus ntawm kev saib xyuas cov cuab yeej acidimeter (ph meter). Nrog rau txoj kev loj hlob ntawm kev tshawb fawb thiab thev naus laus zis, lub ntsuas ntsuas acidity siv niaj hnub no yog pH meter nrog ib lub chip microcomputer qauv. Vim yog qhov sib ntxiv ntawm ib qho-chip microcomputer qauv thiab lwm yam thev naus laus zis, lub teeb liab los ntawm pH ntsuas roj teeb uas muaj cov iav electrode thiab calomel electrode nkag mus rau hauv qhov hluav taws xob tiv thaiv hluav taws xob, thiab tom qab ntawd nkag mus rau hauv analog Circuit Court ntawm ob qhov sib xyaw A / D converter tswj los ntawm microcomputer tom qab uas tsis yog-theem amplification. Lub teeb liab tso zis tau tso tawm los yog tswj los ntawm cov duab digital. Nyob rau hauv txoj kev no, nws muaj kev ua haujlwm xws li calibration nco, tsis siv neeg hloov ntawm txoj kab nqes, tsis siv neeg kub them nyiaj, thiab tshawb nrhiav lub sijhawm. Thaum ntsuas pH cov kev daws teeb meem, tsis tas yuav calibrate ntau zaus, ua rau kev siv cov pH electrode yooj yim dua thiab hloov tau, raug thiab txhim khu kev qha, thiab rov ua tau zoo dua. Tab sis lub hauv paus ntsiab lus tseem yog tib yam. Nrog rau kev loj hlob sai ntawm kev tshawb fawb thiab thev naus laus zis, yav tom ntej, kev ntsuas ntawm acidimeter yuav yooj yim dua, kev ua haujlwm yuav ua haujlwm ntau dua, thiab cov ntaub ntawv yuav raug thiab txhim khu kev qha.
