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溶液的酸碱性用酸碱指示剂能测出,而溶液酸碱性的强弱程度常用pH值表示。pH值在工农业生产中的作用是不言而喻的。有关溶液pH值的试题常从以下几个方面出现。1 测定溶液pH值的方法 例1 用pH试纸测定溶液的酸碱度。若用如图所示的实验,操作有无错误?如有,如何改正? 解析:用pH试纸测定溶液的酸碱度,其操作方法是:用玻璃棒蘸待测液滴在pH试纸上,然后把显示的颜色跟标准比色卡对照,便可知道溶液的pH值。从该操作方法中知:将pH试纸直接放入待测液(污染待测液)或用水润湿pH
The acidity and alkalinity of the solution can be measured with an acid-base indicator, and the pH of the solution is usually expressed as a pH value. The role of pH in industrial and agricultural production is self-evident. Questions about the pH of a solution often appear from the following aspects. 1 Method for Measuring Solution pH Example 1 The pH of the solution was measured with a pH test paper. If you use the experiment shown in the figure, is there any error in the operation? If yes, how to correct? Analyze: Use pH test paper to measure the pH of the solution. The operation method is: use a glass rod to test the droplet on the pH test paper, and then put The color of the solution can be known by comparing the standard color chart. Know from this method of operation: Put the pH test paper directly into the test solution (contaminate the test solution) or wet it with water.