hydroxyl exponent

例句：

1. 1.The pH value of the solution is 5.6, which indicates that it is slightly acidic.
   溶液的pH值为5.6，表明它略呈酸性。
2. 2.The hydroxyl exponent of the compound is 3.8, indicating that it has a high degree of reactivity.
   化合物的羟基指数为3.8，表明它具有很高的反应性。
3. 3. The hydroxyl exponent of the water is 8.7, which means it contains a significant amount of hydrogen ions.
   水的羟基指数为8.7，意味着它含有大量的氢离子。