實驗七 混合物中鹵素離子的電位滴定 預報.pdf

實驗七 混合物中鹵素離子的電位滴定...

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實驗七 混合物中鹵素離子的電位滴定 化學 107 C34034067 鄭羽閎 A 1 一、 目的: 學習利用電位滴定法 , 測定混合液中鹵素離子的含量,並計算出 AgI AgCl K sp 二、 原理: 當金屬 M 浸在含有金屬離子 M n+ 的溶液中時,此金屬可做為指示電極,且 藉由電位的變化而我們可得知金屬離子 M n+ 濃度,如此可偵測鹵素離子 X - M n+ 的沉澱滴定。 M n+ ne - →M E E 0 log[M n+ ] 本實驗是以 AgNO3 來滴定鹵素離子的混合物,在每一個當量點中, [Ag+] 都會有一個突然的變化,亦即電位值有一突然的改變,如此可根據 Nernst equation 推求 [Ag+] ,進而求得其 Ksp ;而且也可以從當量點 Ag+ 的作用量, 計算混合物中不同鹵素離子的含量。 三、 試劑及儀器: NaI AgNO 3(s) NaCl Ba(NO 3 ) 2(s) 銀指示電極 6N HNO 3 伏特計 Ag/AgCl 參考電極 四、 驗步驟: 《配置 AgNO 3 標準溶液》 1. 秤取 2.12 g AgNO
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