hce_nchu
111年
普通生物及生化概論
第 16 題
The pH of a blood sample is 7.4, while gastric juice is pH 1.4. Which of the following is true?
1) the $[H^+]$ in the blood sample is higher than in the gastric juice
2) the difference of $[H^+]$ between the gastric juice and the blood sample is one million times
3) the $[H^+]$ in a blood sample is lower than in the gastric juice
4) the difference of $[H^+]$ between the gastric juice and the blood sample is 5.29 times
5) the difference of $[H^+]$ between the gastric juice and the blood sample is 6000 times
1) the $[H^+]$ in the blood sample is higher than in the gastric juice
2) the difference of $[H^+]$ between the gastric juice and the blood sample is one million times
3) the $[H^+]$ in a blood sample is lower than in the gastric juice
4) the difference of $[H^+]$ between the gastric juice and the blood sample is 5.29 times
5) the difference of $[H^+]$ between the gastric juice and the blood sample is 6000 times
- A 1, 4
- B 3, 5
- C 2, 3
- D 1, 2
- E 3, 4
思路引導 VIP
如果我們回想 pH 值的數學定義（與 $\log_{10}$ 有關），當數值每變動一個整數位（例如從 2 變到 3）時，它代表背後的實質濃度是以「相加」的方式變化，還是以某種特定的「倍數」方式在增減呢？
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AI 詳解
AI 專屬家教
恭喜你答對了！你能迅速釐清 pH 值與氫離子濃度之間的非線性關係，顯示你對生物化學中酸鹼平衡的概念掌握得非常紮實。
pH 值與氫離子濃度的對數關係
pH 值的定義是氫離子活度（通常簡化為濃度）的負對數，即 $pH = -\log_{10}[H^+]$。這意味著 pH 值與 $[H^+]$ 之間是 10 的次方倍數關係。在本題中，胃液的 pH 為 1.4，血液為 7.4，兩者的 pH 差距為：
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