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實驗八 溶解度積之測定

實驗八 溶解度積之測定. 一 . 目的 求不同溫度下,醋酸銀 (CH 3 COOAg) 的溶解度積. 二 . 原理 A m B n (s) mA n+ + nB m- 溶解度積 K sp = [A n+ ] m [B m- ] n AgOAc (s) Ag + (aq) + OAc - (aq) K sp = [Ag + ][OAc - ] 沉澱滴定 Ag + (aq) + SCN - (aq) AgSCN (s) ( 白色沉澱 )

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實驗八 溶解度積之測定

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  1. 實驗八 溶解度積之測定

  2. 一. 目的 求不同溫度下,醋酸銀(CH3COOAg)的溶解度積

  3. 二. 原理 AmBn (s) mAn+ + nBm- 溶解度積 Ksp = [An+]m[Bm-]n AgOAc(s) Ag+(aq) + OAc-(aq) Ksp = [Ag+][OAc-] 沉澱滴定 Ag+(aq) + SCN-(aq) AgSCN (s) (白色沉澱) Fe3+(aq) + SCN-(aq) FeSCN2+(aq) (指示劑) (紅色錯離子)

  4. 滴定法: 1.沉澱滴定: 2.酸鹼滴定: 3.氧化還原滴定:

  5. 三. 儀器與材料 滴定管 電磁加熱攪拌器 分度吸量管 磁攪拌子 錐形瓶 安全吸球 燒杯 保麗龍冰浴杯 漏斗 濾紙 鐵架

  6. 四. 藥品 鐵指示劑: 鐵明礬 (NH4Fe(SO4)2·12H2O) 溶於 6 N HNO3 0.05 M 硫氰化鉀 (KSCN) 0.02 M 硝酸銀 (AgNO3) 0.30 M 醋酸鈉 (CH3COONa)

  7. CH3COONa KSCN AgNO3

  8. 五. 實驗步驟 10 mL 0.2 M AgNO3 + 15 mL 0.3 M NaOAc 攪拌20分鐘後量溫度 (1)室溫 (2)冰浴 重力過濾 收濾液(AgOAc飽和溶液) 加入1 mL Fe+3指示劑 在滴定管中加入0.050 M KSCN 滴定 先做 5 mL預滴定再做 10 mL的精確滴定

  9. (錯誤)(正確)

  10. 達到滴定終點

  11. 六. 注意事項 1. 此過濾步驟之濾紙不得以蒸餾水潤溼,以 免稀釋溶液濃度。 2. 過濾時,尚未濾完之剩餘溶液應保持在冰 浴中,以免回溫致Ksp 值改變。 3. 本實驗之廢液及沉澱物均含重金屬Ag,要 回收於重金屬廢液桶。

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