Litmus test" redirects here. For other uses, see Litmus test (disambiguation).
Litmus paper being used
The main use of litmus is to test whether a solution is acidic or basic. Wet litmus paper can also be used to test water-soluble gases; the gas dissolves in the water and the resulting solution colors the litmus paper. For instance, ammonia gas, which is alkaline, colors the red litmus paper blue.
Litmus (pH indicator)
below pH 4.5 above pH 8.3
4.5 ↔ 8.3
Chemical reactions other than acid-base reaction can also cause a color-change to litmus paper. For instance, chlorine gas turns blue litmus paper white – the litmus dye is bleached,[5] due to presence of hypochlorite ions. This reaction is irreversible and therefore the litmus is not acting as an indicator in this situation.
Litmus test" redirects here. For other uses, see Litmus test (disambiguation).
Litmus paper being used
The main use of litmus is to test whether a solution is acidic or basic. Wet litmus paper can also be used to test water-soluble gases; the gas dissolves in the water and the resulting solution colors the litmus paper. For instance, ammonia gas, which is alkaline, colors the red litmus paper blue.
Litmus (pH indicator)
below pH 4.5 above pH 8.3
4.5 ↔ 8.3
Chemical reactions other than acid-base reaction can also cause a color-change to litmus paper. For instance, chlorine gas turns blue litmus paper white – the litmus dye is bleached,[5] due to presence of hypochlorite ions. This reaction is irreversible and therefore the litmus is not acting as an indicator in this situation.
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