碱度

例句：

1. 1. The pH level of the solution is 7.2, which is quite alkaline.
   溶液的pH值为7.2，相当碱性。
2. 2. The soil has a high alkalinity, which can lead to problems with plant growth.
   土壤具有较高的碱性，可能导致植物生长问题。
3. 3. The chemical reaction between acids and bases is an example of acid-base neutralization, where the pH level changes from alkaline to acidic.
   酸和碱之间的化学反应是酸碱中和的例子，pH值从碱性变为酸性。