Taw qhia rau Txoj Cai Ua Haujlwm ntawm pH Meter
Lub pH meter yog siv los ntsuas pH tus nqi ntawm cov tshuaj siv txoj kev potentiometric. Yog li ntawd, ntxiv rau kev ntsuas pH tus nqi ntawm cov tshuaj, hom kev ua haujlwm ntawm pH meter kuj tuaj yeem ntsuas lub zog hluav taws xob ntawm lub roj teeb. PH, hauv Latin, yog cov ntawv luv rau Pondus hydrogeni, uas yog cov haujlwm ntawm hydrogen ions hauv ib yam khoom. PH yog qhov tsis zoo logarithm ntawm qhov concentration ntawm hydrogen ions.
Lub ntsiab ntsuas ntawm pH meter yog iav electrode thiab siv electrode. Cov iav electrode yog rhiab heev rau pH, thaum lub peev xwm ntawm kev siv electrode ruaj khov. Muab ob lub electrodes ntawm pH meter ua ke rau hauv tib txoj kev daws teeb meem ua ib lub xov tooj ntawm tes, thiab lub peev xwm ntawm lub xov tooj tseem ceeb no yog qhov algebraic sum ntawm lub peev xwm ntawm iav electrode thiab cov ntaub ntawv siv electrode.
Kev siv electrode muaj peev xwm ntawm pH meter yog qhov ruaj khov, yog li nyob rau hauv qhov kub thiab txias, qhov kev hloov pauv ntawm cov roj teeb qub uas muaj cov tshuaj thiab cov electrode tsuas yog cuam tshuam nrog lub peev xwm ntawm iav electrode, uas nyob ntawm tus nqi pH ntawm cov tshuaj raug ntsuas. Yog li, los ntawm kev ntsuas qhov kev hloov pauv, tus nqi pH ntawm cov tshuaj pH tuaj yeem tau txais.
Kev npaj ua haujlwm ua ntej siv lub ntsuas pH
1. Ua ntej siv lub ntsuas pH, ntxuav cov electrode nrog dej distilled thiab ceev faj kom tsis txhob tawg cov iav electrode.
2. Npaj muab NAOH thiab HCL kev daws teeb meem rau kev hloov kho ntawm ib sab ntawm pH meter ntawm lub platform.
3. Tshem tawm cov tshuaj pH (pH=7.0) ntawm lub tub yees thiab muab tso rau ntawm lub platform.
4. Open the pH meter, set the pH value, press the ^>tus yuam sij xaiv pH thiab CAL xaiv, xaiv qhov kev xaiv CAL, kho thiab ntxig rau hauv cov tshuaj pH (pH=7.0), nias lub "" yuam sij xaiv cov ntaub ntawv tus nqi rau 7.0, thiab yim rab diav me me yuav tshwm sim.
5. Ntxig lub iav electrode rau hauv cov tshuaj yuav tsum tau kuaj, tom qab ntawd muab lwm cov electrode thiab do cov kua nto kom tsim nyog (ceeb toom: tsis txhob tsoo lub iav electrode).
6. Thaum siv lub tshuab hluav taws xob ntawm pH meter, yuav tsum tau them nyiaj rau kev tiv thaiv ntawm lub voj voog. Thaum tsis ntsuas pH tus nqi, cov tswv yim ntawm pH meter yuav tsum luv luv Circuit Court kom tsis txhob muaj kev puas tsuaj rau pH meter.
7. Lub qhov (socket) iav electrode ntawm lub ntsuas pH yuav tsum tau ua kom huv si, huv si, thiab qhuav, thiab yuav tsum tsis txhob cuam tshuam nrog cov pa phem xws li tshuaj tsuag ntsev thiab kua qaub. Nyob rau tib lub sij hawm, nws yog nruj me ntsis txwv tsis pub rau lub iav electrode qhov (socket) kom kis tau tus kab mob aqueous tov kom tsis txhob muaj siab input impedance ntawm pH meter.
8. Ceev faj thaum ntxiv cov kev daws teeb meem xws li NaOH thiab HCL ua ntej ncav cuag tus nqi pH uas koj xav tau (nyob ntawm qhov kev hloov kho, qhov sib txawv ntawm cov kev hloov kho tuaj yeem xaiv tau, nrog rau kev ceev ntxiv thaum lub concentration tsawg thiab qeeb ntxiv thaum lub concentration siab).
9. Ceev faj kom tsis txhob muaj ntau tshaj qhov xav tau thaum ntxiv cov kua.
