實驗二 氧化還原滴定法 結報.docx

實驗二 氧化還原滴定法 結報.docx - 實驗二...

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實驗二 氧化還原滴定法 結報 化學 107 C34034067 鄭羽閎 A 1 1 實驗數據結果及計算處理: 《配製 KMnO 4 溶液》 KMnO 4 = 0.1577g/158(g/mol)/0.1L = 0.00998 M ( KMnO 4 分子量: 158) 《用 Na 2 C 2 O 4 標定 KMnO 4 Na 2 C 2 O 4 分子量: 133.999 KMnO 4 分子量: 158.034 5Na 2 C 2 O 4 + 2KMnO 4 + 3H 2 SO 4 → K 2 SO 4 + 2MnSO 4 + 10CO 2 + 8H 2 O+5Na 2 SO 4 #1 Na 2 C 2 O 4 重量 0.0527 g 耗去 KMn0 4 18.2 mL →KMnO4 相對濃度為 0.00864 M #2 Na 2 C 2 O 4 重量 0.0526 g 耗去 KMn0 4 16.9 mL →KMnO4 相對濃度為 0.00929 M 平均標定濃度為 0.00897 M 《分析褐鐵礦》 #1 褐鐵礦重量 0.1033 g KMn0 4 初滴定 26.1 mL →0.0261 × 0.00897 × 5 = 0.00117mole Fe 2+ Fe 2 O 3 含量 % = 0.00117 ÷ 2 × 159.69 ÷ 0.1033 × 100% = 90.434% #2 褐鐵礦重量 0.0999 g 滴定管讀 電位 顏色 V E E/ V V* 2E/ V V** 0 白濁 2 2 0 0 4 2 0 0 0 2 0 6 2 0 0 0 2 0 8 2 0 0 0 2 0 10 0.36 2 0.36 0.18 0.18 2 0.09 12 0.369 2 0.009 0.0045 - 0.1755 2 - 0.08775 14 0.377 2 0.008 0.004 - 0.0005 2 - 0.00025 16 0.386 2 0.009 0.0045 0.0005 2 0.00025 18 0.398 2 0.012 0.006 0.0015 2 0.00075 20 0.41 2 0.012 0.006 -2.8E- 17 2 -1.4E- 17 21 0.419 1 0.009 0.009 0.003 1.5 0.002 22 0.431 1 0.012 0.012 0.003 1 0.003 23 0.452 1 0.021 0.021 0.009 1 0.009 23.5 0.479 0.5 0.027 0.054 0.033 0.75 0.044 24 0.846 粉白 0.5 0.367 0.734 0.68 0.5 1.36
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24.1 0.876 0.1 0.03 0.3 -0.434 0.3 - 1.44667 24.2 0.886 0.1 0.01 0.1 -0.2 0.1 -2 24.4 0.901 0.2 0.015 0.075 -0.025 0.15 - 0.16667 24.5 0.91 0.1 0.009 0.09 0.015 0.15 0.1 24.7 0.92 淡粉 0.2 0.01 0.05 -0.04 0.15 - 0.26667 24.9 0.93 0.2 0.01 0.05 0 0.2 0 25 0.934 0.1 0.004 0.04 -0.01 0.15 - 0.06667 25.5 0.944 0.5 0.01 0.02 -0.02 0.3 - 0.06667 26 0.955 0.5 0.011 0.022 0.002 0.5 0.004 26.5 0.964 0.5 0.009 0.018 -0.004 0.5 -0.008 1. KMnO 4 體積對電位 E 作圖: 0 5 10 15 20 25 30 0 2 4 6 8 10 12 電位 (V) 電位 (V) 2. 一次微分圖:
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0 5 10 15 20 25 30 0 2 4 6 8 10 12 一次微分滴定曲線
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