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<span>PH計(jì)在使用前要做好準(zhǔn)備工作</span></p> </div> <div id="asq0aki4iuk" class="ly_NyNewsdetail"> <h1 class="NyNewsdetail_title">PH計(jì)在使用前要做好準(zhǔn)備工作</h1> <div id="asq0aki4iuk" class="NyNewsdetail_tips">更新時(shí)間：2021-03-30 點(diǎn)擊次數(shù)：2099</div> <div id="asq0aki4iuk" class="NyNewsdetail_con"> <div>　　<strong><a href="http:///ParentList-173339.html" target="_blank">PH計(jì)</a></strong>是測量和反應(yīng)溶液酸堿度的重要工具，PH計(jì)的型號和產(chǎn)品多種多樣，顯示方式也有指針顯示和數(shù)字顯示兩種可選，但是無論P(yáng)H計(jì)的類型如何變化，它的工作原理都是相同的，其主體是一個(gè)精密的電位計(jì)。</div><div>　　PH計(jì)是以電位測定法來測量溶液PH值的，因此PH計(jì)的工作方式，除了能測量溶液的PH值以外，，還可以測量電池的電動(dòng)勢。PH在拉丁文中，是Pondushydrogenii的縮寫，是物質(zhì)中氫離子的活度，PH值則是氫離子濃度的對數(shù)的負(fù)數(shù)。</div><div>　　PH計(jì)的主要測量部件是玻璃電極和參比電極，玻璃電極對PH敏感，而參比電極的電位穩(wěn)定。將PH計(jì)的這兩個(gè)電極一起放入同一溶液中，就構(gòu)成了一個(gè)原電池，而這個(gè)原電池的電位，就是這玻璃電極和參比電極電位的代數(shù)和。</div><div>　　PH計(jì)的參比電極電位穩(wěn)定，那么在溫度保持穩(wěn)定的情況下，溶液和電極所組成的原電池的電位變化，只和玻璃電極的電位有關(guān)，而玻璃電極的電位取決于待測溶液的PH值，因此通過對電位的變化測量，就可以得出PH溶液的PH值。</div><div>　　ph計(jì)使用前的準(zhǔn)備工作</div><div>　　1、使用PH計(jì)之前先用三蒸水清洗電極，注意玻璃電極不要碰碎。</div><div>　　2、準(zhǔn)備在平臺PH計(jì)的旁邊放至調(diào)節(jié)用的NAOH液和HCL液。</div><div>　　3、在冰箱中拿出定PH液（PH=7.0），放與平臺上。</div><div>　　4、打開PH計(jì)，調(diào)定PH值，按︿﹀鍵選擇PH和CAL選項(xiàng)，選擇其中的CAL項(xiàng)，調(diào)節(jié)插入到PH液（PH=7.0）中，按《》鍵選擇數(shù)據(jù)值到7.0處，出現(xiàn)小八叉即可。</div><div>　　5、將玻璃電極插入到待測的溶液中，再放入另一電極，適當(dāng)?shù)臄噭?dòng)液面（注意：不要碰碎玻璃電極）。</div><div>　　6、PH計(jì)的電子單元使用必須注意電路的保護(hù)，在不進(jìn)行PH值測量時(shí)，要將PH計(jì)的輸入短路，以避免PH計(jì)的損壞。</div><div>　　7、PH計(jì)的玻璃電極插座必須保持干凈、清潔和干燥，不能接觸鹽霧和酸霧等有害氣體，同時(shí)嚴(yán)禁玻璃電極插座上沾有任何的水溶液，以避免PH計(jì)高輸入阻抗。</div><div>　　8、未到你需要的PH值時(shí)要小心的加如NAOH液和HCL液，（據(jù)調(diào)節(jié)范圍不同可以選擇不同濃度的調(diào)節(jié)液，濃度小時(shí)可以快加，濃度大時(shí)要加慢）。</div><div>　　9、加液時(shí)小心不要超過所需的定容量。</div> 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