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自然科學 大學

求解37 38( ;´Д`)

37. A sodium salt (NaHA, 4.1 mole) is dissolved in 1.0 L water. The solution's pH is 5.0 after some acid or base is added in the solution. What is the concentration of HA at pH 5.0 if the Kai and Ka2 of H2A are 1 x 109 and 5 x 10-?, respectively? A) 0.1 M; B) 0.2 M; C) 0.5 M; D) 1.0 M; E) 2.0 M 38. Continued from the previous question. What is the concentration of A2- A) 0.1 M; B) 0.2 M; C) 0.5 M; D) 1.0 M; E) 2.0 M

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自然科學 大學

請問第44題要怎麼寫? 第二張圖是我的寫法,因為cu->cu2+發生氧化反應,所以另一個的氧化E°必須小於cu的,這樣cu才能發生氧化,請問這種想法是錯的嗎?? :(

44. Which one of the following reagents is capable of transforming Cu(s) to Cuf* (1 M)? A) I (1M) B) Ni(s) C) Ag" (1 M) D) AP* (1 M) E) Hf (1 M) Ans: C Category: Medium Section: 19.3 45. Which one of the following reagents is capable of transforming Fe3+ (1 M) to Fe2+ (1 M)?

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