Question

From where do we obtain litmus? How can litmus paper
help in determing the nature of substances as acidic or basic​

Answer 1

Answer:

1. Litmus can be found in different species of lichens. The dyes are extracted from such species as Roccella tinctoria (South American), Roccella fuciformis (Angola and Madagascar), Roccella pygmaea (Algeria), Roccella phycopsis, Lecanora tartarea (Norway, Sweden), Variolaria dealbata, Ochrolechia parella, Parmotrema tinctorum, and Parmelia.

2. Initially, litmus paper is either red or blue. The blue paper changes to red, indicating acidity somewhere between the pH range of 4.5 to 8.3. (Note that 8.3 is alkaline.) Red litmus paper can indicate alkalinity with a change to blue. In general, litmus paper is red below a pH of 4.5 and blue above a pH of 8.3.

If the paper turns purple, this indicates the pH is near neutral. Red paper that does not change color indicates the sample is an acid. Blue paper that does not change color indicates the sample is a base.

Explanation:

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