Question

how does litmus indicator work​

Answer 1

Answer:

So why does litmus behave this way? It’s because of 7-hydroxyphenoxazone. When exposed to acids below pH 4.5, the molecule looks like the image below and this gives litmus paper its red color. As the pH of the test solution moves towards alkaline, one of the hydrogen atoms (white hemispheres) starts to break off (disassociate). In the picture below, it is the hydrogen at the bottom left.

As the pH approaches neutrality (pH 7) more and more of the indicator molecules lose this hydrogen atom. At pH7, half the litmus molecules will still have this hydrogen in place and the other half won’t. This mixture produces the shades of purple in the mid range. Once the solution goes to alkaline pH 8.3 or higher, all the hydrogen will have disassociated and the litmus indicator is now blue.

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Answer 2

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Working of Litmus Indicator solution :-

Litmus Indicator Solution turns red when it comes in contact with any acidic solution and turns blue when it comes in contact with any Alkaline solution.

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