hce_kmu
113年
物理及化學
第 72 題
Which of the following statements is correct?
- A Arrhenius postulated that an acid is a proton ($\text{H}^+$) donor, and a base is a proton acceptor.
- B A buffer with a large capacity contains large volumes of the buffering components.
- C For the titrations of weak acids with strong bases, the greater pH value at the equivalence point is obtained when the stronger acid is used.
- D For a particular buffering system, all solutions that have the same ratio of $[\text{A}^-]/[\text{HA}]$ have the same pH value.
- E An acid-base indicator can be used to determine the equivalence point of an acid-base titration because of its ability to mark the half-equivalence point of a titration by changing color.
思路引導 VIP
當我們在討論一個由弱酸及其共軛鹼組成的平衡系統時，請回想一下：決定溶液酸鹼度（pH 值）的最關鍵「數學關係式」是什麼？如果我們在不改變溫度的情況下，僅僅改變系統中酸與鹼的絕對數量，但刻意維持它們之間的「相對比例」固定，那麼根據那個關係式，最終計算出來的數值會發生變化嗎？