Kev ntsuas kub npaum li cas cuam tshuam rau pH raug?
Kub hloov pauv txhua tus nqi pH rau pH electrodes los ntawm {{0}} 003pH / degree . Piv txwv li, pH meter ntawm qib 0.2 yog ntsuas hauv pH tsis nyob ntawm 30 degree thiab tom qab kuaj ntawm 60 degree (xav tias pH ntawm cov tshuaj nyob ntawm pH 6 txog 8) Yog pH7.{{11 }} thiab pH7.00 txawv ntawm ib chav pH, qhov siab tshaj plaws yuam kev tshwm sim los ntawm qhov kub thiab txias yog 30 0.003=0.09 pH. Qhov yuam kev loj tshaj plaws yog 0.27 pH yog tias nws yog 3 pH units (nruab nrab pH 4 thiab 10), uas qhia tau hais tias qhov kub thiab txias muaj feem cuam tshuam rau pH. Tau kawg, peb tuaj yeem ua qhov kev xav los ntawm nws ib yam. Peb yuav tsum paub txog peb yam hauv qab no txhawm rau txo qhov tsis raug ntawm qhov ntsuas kub rau pH ntsuas:
(1) Txhawm rau ntsuas pH ntsuas pH, sim siv cov tshuaj tsis haum uas nyob ze rau pH ntawm cov tshuaj yuav tsum tau kuaj.
(2) Ua tib zoo saib xyuas qhov ntsuas qhov ntsuas qhov ntsuas kub ntawm, lossis ze ze, qhov ntsuas ntsuas.
(3) Koj yuav tsum xaiv lub ntsuas pH nrog rau qhov kub thiab txias.
Kev kho qhov kub thiab txias tsuas yog muaj nyob rau ntawm pH meters nrog qhov tseeb ntau dua {{0}}.1pH; pH ntsuas nrog qib ntawm 0.2 tsis. Qee qhov pH ntsuas nrog 0.2- qib raug kuj tshaj tawm 0 1- qib raug. Qhov no yeej tsis ua tau. Qee tus neeg sib xyaw cov ntsiab lus "kev daws teeb meem {{10}}.1pH" nrog "qhov tseeb 0.1pH." Qhov pH tsis raug ntawm qhov deb ntawm 60 degree, txawm tias nyob rau hauv ib chav tsev pH, yog 0.{14}}.18pH. Yog li ntawd, pH ntsuas qhov siab tshaj plaws yam tsis muaj kev kho qhov kub thiab txias tsuas yog 0.2pH.
