chemical indicator
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Meanings
1 sense · 4 examplesnoun
chemical indicator; a reagent used to test for the presence of a specific compound, element, or ion, or to show changes in chemical properties
technicalCommonly used in analytical chemistry and laboratory settings to determine pH levels, endpoints of titrations, or the presence of specific ions. Color change is the most common detection method.
Fēn酚
tài酞
shì是
yī一
zhǒng种
cháng常
yòng用
de的
suān酸
jiǎn碱
zhǐ指
shì示
jì剂
,
zài在
jiǎn碱
xìng性
róng溶
yè液
zhōng中
huì会
biàn变
wéi为
fěn粉
hóng红
sè色
。
Phenolphthalein is a commonly used acid-base indicator that turns pink in alkaline solutions.
Zài在
dī滴
dìng定
shí实
yàn验
zhōng中
,
xuǎn选
zé择
hé合
shì适
de的
zhǐ指
shì示
jì剂
duì对
yú于
zhǔn准
què确
pàn判
duàn断
zhōng终
diǎn点
zhì至
guān关
zhòng重
yào要
。
In titration experiments, selecting the appropriate indicator is crucial for accurately determining the endpoint.
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Shí石
ruǐ蕊
shì试
zhǐ纸
shì是
yī一
zhǒng种
jiǎn简
dān单
de的
zhǐ指
shì示
jì剂
,
kě可
yǐ以
cū粗
lüè略
cè测
liáng量
róng溶
yè液
de的
suān酸
jiǎn碱
dù度
。
Litmus paper is a simple indicator that can roughly measure the acidity or alkalinity of a solution.
Jīn金
shǔ属
zhǐ指
shì示
jì剂
kě可
yǐ以
yòng用
lái来
cè测
dìng定
shuǐ水
zhōng中
gài钙
měi镁
lí离
zǐ子
de的
hán含
liàng量
。
Metal indicators can be used to determine the content of calcium and magnesium ions in water.