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pH 測定儀原理及方法簡介
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pH 測定儀原理及方法簡介. pH 值之定義. 水溶液之酸鹼度由其氫離子濃度 [H + ] 決定， [H + ] 越高，酸性越強。 酸鹼度一般以氫離子濃度指數 (pH 值 ) 表示 pH = -log[H + ] 或 pH=-log a H+ 。 25℃ 純水，解離常數 K w = [H + ][OH - ]=10 -14 ， 此時 pH = -log[10 -7 ] = 7 ， 溶液 pH 值 7 呈鹼性。 - PowerPoint PPT Presentation
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pH
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pH[H+] [H+](pH)pH = -log[H+]pH=-log aH+ 25Kw = [H+][OH-]=10-14pH
= -log[10-7] = 7pH7pH257257
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pHHCl + H2O Cl- + H3O+ HClO4+ H2O ClO4- + H3O+0.01 M
HClpH2.08()
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pHpHpHpHpHpH
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pHpHpH
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pHpH HIn H+ + In- 1 2
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pHpHpHpHpH(0.2)
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pH pHpHpH
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pH
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25
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pH0.5mm( )/
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pH
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UProbeP1P5P4P6P3P2P1: P2: P3: P4: P5: P6:
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pHpHpHpH()pH
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pHpH7250 mVpH 725pH1-59.16 mV/pH2 (mV/pH)
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pHpH pH
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100%0.001 MpH 3 pH = -log [H+]
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100%0.001 MpHpKw = pH + pOH pOH3.00pkw pH
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pH
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pHpH100%pHpHpHkwkwpH
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pHpH25
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pH pH 7.00 pH (mV) pH (mV) 0 pH pH 1.00 (mV)% %
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pH pH 7.00 0 mVpH pH 7.00 pH pH
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pH25 - 59.2mV / pH pH % pH 25 25 -59.2 100% %
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pH pH 0.1 pH -25 ~ 25 mV pH 6.55 ~ 7.45 -56 ~ -61mV / pH 95 ~
103%
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S
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pHpH
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pHpH pH pH E0
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pH
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10.0pH
