A. acid B. base C. salt D. water 相关知识点: 试题来源: 解析 B。原因:“For example, litmus paper can turn from red to blue in the presence of a base and from blue to red in the presence of an acid.”。 反馈 收藏
The litmus paper test is a simple test in order to determine whether a given solution is acidic or basic. After placing a drop of solution on the litmus paper, if it changes a red litmus paper to blue, the solution is basic. If it changes a blue litmus paper to red, the so...
Acid-Base Indicator: As the name itself suggests, an indicator is a chemical substance that is used to identify whether a chemical compound is an acid or a base. There are many such indicators and the most commonly used ones are litmus paper and phenolphthalein. Answer and Explanation: Pheno...
A. Tastes sweet B. Turns litmus paper blue C. Reacts with metals to produce hydrogen gas D. Has no E. ffect on indicators 相关知识点: 试题来源: 解析 C。本题考查酸的性质。酸尝起来是酸的,不是甜的,A 错误;酸能使石蕊试纸变红,不是变蓝,B 错误;酸能和金属反应产生氢气,C 正确;酸对指...