PH的概念-深圳市慧聰源環(huán)?？萍加邢薰?/title> <link rel="stylesheet" type="text/css" href="/skins/270528/css/style.css"> <script src="/skins/270528/js/jquery-3.6.0.min.js"></script> <link rel="shortcut icon" href="/skins/270528/favicon.ico">  <script type="text/javascript"> document.addEventListener("touchstart", function () { }, true); </script>  <script language="javascript" type="text/javascript"> var nav= '5'; </script>  <script type="application/ld+json"> { "@context": "https://ziyuan.baidu.com/contexts/cambrian.jsonld", "@id": "http://xywf.com.cn/szhcy-Article-3190477/", "title": "PH的概念", "pubDate": "2022-11-10T08:39:44", "upDate": "2022-11-10T08:39:44" }</script> <script language="javaScript" src="/js/JSChat.js"></script><script language="javaScript">function ChatBoxClickGXH() { DoChatBoxClickGXH('https://chat.chem17.com',262687) }</script><script> (function(){ var bp = document.createElement('script'); var curProtocol = window.location.protocol.split(':')[0]; if (curProtocol === 'https') 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mso-spacerun: "yes"; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri; mso-bidi-font-family: "Times New Roman"; mso-font-kerning: 1.0000pt;"><span style="font-family: 宋體;">是拉丁文</span><span style="font-family: 宋體;">“</span><span style="font-family: Calibri;">Pondus hydrogenii</span><span style="font-family: 宋體;">"一詞的縮寫(xiě)（</span><span style="font-family: Calibri;">Pondus=</span><span style="font-family: 宋體;">壓強(qiáng)、壓力，</span><span style="font-family: Calibri;">hydrogenium=</span><span style="font-family: 宋體;">氫），用來(lái)量度物質(zhì)中氫離子的活性。這一活性直接關(guān)系到水溶液的酸性、中性和堿性。</span></span></p><p style="margin: 0pt;"><span style="font-family: 宋體; font-size: 10.5pt; mso-spacerun: "yes"; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri; mso-bidi-font-family: "Times New Roman"; mso-font-kerning: 1.0000pt;"> <span style="font-family: 宋體;">離子活性度，是指電解質(zhì)溶液中參與電化學(xué)反應(yīng)的離子的有效濃度。離子活度（</span><span style="font-family: 宋體;">α）和濃度（</span><span style="font-family: Calibri;">c</span><span style="font-family: 宋體;">）之間存在定量的關(guān)系，其表達(dá)式為：α</span><span style="font-family: Calibri;">=</span><span style="font-family: 宋體;">γ</span><span style="font-family: Calibri;">c</span><span style="font-family: 宋體;">式中：α為離子的活度；γ為離子的活度系數(shù)；</span><span style="font-family: Calibri;">c</span><span style="font-family: 宋體;">為離子的濃度。</span></span></p><p style="margin: 0pt;"><span style="font-family: 宋體; font-size: 10.5pt; mso-spacerun: "yes"; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri; mso-bidi-font-family: "Times New Roman"; mso-font-kerning: 1.0000pt;"> <span style="font-family: 宋體;">γ通常小于</span><span style="font-family: Calibri;">1</span><span style="font-family: 宋體;">，在溶液無(wú)限稀時(shí)離子間相互作用趨于零，此時(shí)活度系數(shù)趨于</span><span style="font-family: Calibri;">1</span><span style="font-family: 宋體;">，活度等于溶液的實(shí)際濃度。一般在水溶液中</span><span style="font-family: Calibri;">H</span><span style="font-family: 宋體;">離子的濃度非常小，所以</span><span style="font-family: Calibri;">H</span><span style="font-family: 宋體;">離子的活度基本和其濃度相等。</span></span></p><p style="margin: 0pt;"><span style="font-family: 宋體; font-size: 10.5pt; mso-spacerun: "yes"; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri; mso-bidi-font-family: "Times New Roman"; mso-font-kerning: 1.0000pt;"> <span style="font-family: 宋體;">根據(jù)能斯特方程，離子活度與電極電位成正比，因此可對(duì)溶液建立起<strong>電極</strong>電位與活度的關(guān)系曲線(xiàn)，此時(shí)測(cè)定了電位，即可確定離子活度，實(shí)際上是通過(guò)測(cè)量電位</span><span style="font-family: Calibri;">mV</span><span style="font-family: 宋體;">，來(lái)計(jì)算</span><span style="font-family: Calibri;">H</span><span style="font-family: 宋體;">離子的濃度的。</span></span></p><p> <strong><span style="font-family: Calibri; font-size: 10.5pt; mso-spacerun: "yes"; mso-bidi-font-family: "Times New Roman"; mso-font-kerning: 1.0000pt; mso-fareast-font-family: 宋體;">PH</span><span style="font-family: 宋體; font-size: 10.5pt; mso-spacerun: "yes"; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri; mso-bidi-font-family: "Times New Roman"; mso-font-kerning: 1.0000pt;"><span style="font-family: 宋體;">計(jì)、</span></span><span style="font-family: Calibri; font-size: 10.5pt; mso-spacerun: "yes"; mso-bidi-font-family: "Times New Roman"; mso-font-kerning: 1.0000pt; mso-fareast-font-family: 宋體;">PH</span><span style="font-family: 宋體; font-size: 10.5pt; mso-spacerun: "yes"; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri; mso-bidi-font-family: "Times New Roman"; mso-font-kerning: 1.0000pt;"><span style="font-family: 宋體;">儀表、</span></span><span style="font-family: Calibri; font-size: 10.5pt; mso-spacerun: "yes"; mso-bidi-font-family: "Times New Roman"; mso-font-kerning: 1.0000pt; mso-fareast-font-family: 宋體;">PH</span><span style="font-family: 宋體; font-size: 10.5pt; mso-spacerun: "yes"; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri; mso-bidi-font-family: "Times New Roman"; mso-font-kerning: 1.0000pt;"><span style="font-family: 宋體;">控制儀，</span></span><span style="font-family: Calibri; font-size: 10.5pt; mso-spacerun: "yes"; mso-bidi-font-family: "Times New Roman"; mso-font-kerning: 1.0000pt; mso-fareast-font-family: 宋體;">PH電極</span><span style="font-family: 宋體; font-size: 10.5pt; mso-spacerun: "yes"; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri; mso-bidi-font-family: "Times New Roman"; mso-font-kerning: 1.0000pt;"><span style="font-family: 宋體;">，</span></span><span style="font-family: Calibri; font-size: 10.5pt; mso-spacerun: "yes"; mso-bidi-font-family: "Times New Roman"; mso-font-kerning: 1.0000pt; mso-fareast-font-family: 宋體;">PH</span><span style="font-family: 宋體; font-size: 10.5pt; mso-spacerun: "yes"; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri; mso-bidi-font-family: "Times New Roman"; mso-font-kerning: 1.0000pt;"><span style="font-family: 宋體;">酸堿度分析儀</span></span></strong></p><p> </p> </div> <div id="35hf15jpnp" class="ly_PrevNext"> <ul> <li>上一篇：<a 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