scholar05
scholar05 scholar05
  • 12-11-2018
  • Biology
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What is a chemical indicator ?

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ac201857 ac201857
  • 14-11-2018

any substance that gives a visible sign, usually by a colour change, of the presence or absence of a threshold concentration of a chemical species, such as an acid or an alkali in a solution. An example is the substance called methyl yellow, which imparts a yellow colour to an alkaline solution

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