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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（</span><span style="font-family: Calibri;">Pondus=</span><span style="font-family: 宋體;">壓強、壓力，</span><span style="font-family: Calibri;">hydrogenium=</span><span style="font-family: 宋體;">氫），用來量度物質(zhì)中氫離子的活性。這一活性直接關系到水溶液的酸性、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)溶液中參與電化學反應的離子的有效濃度。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;">）之間存在定量的關系，其表達式為：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;">，在溶液無限稀時離子間相互作用趨于零，此時活度系數(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，因此可對溶液建立起<strong>電極</strong>電位與活度的關系曲線，此時測定了電位，即可確定離子活度，實際上是通過測量電位</span><span style="font-family: Calibri;">mV</span><span style="font-family: 宋體;">，來計算</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、</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="pztzlxn" class="ly_PrevNext"> <ul> <li>上一篇：<a href="/szhcy-Article-3195276/">制取工業(yè)純水用的設備是哪種？</a></li> <li>下一篇：<a href="/szhcy-Article-3185602/">RO反滲透設備可以用于哪些工業(yè)用水</a></li> </ul> </div> </div>   <div id="5hpdrfr" 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