), the paper must be with distilled water first so the gas can dissolve and produce ions.
A more versatile option that can turn red in the presence of an acid or blue in the presence of a base. Testing Procedures litmus paper
Primarily used to test for acids. It remains blue in basic or neutral solutions and turns red in acidic ones. ), the paper must be with distilled water
The primary purpose of litmus paper is to provide a quick, qualitative assessment of a substance's nature. Unlike pH strips or digital meters, it does not provide an exact numerical pH value; instead, it indicates a range where a color change occurs, typically between pH 4.5 and 8.3. Turn blue litmus paper red . Bases: Turn red litmus paper blue . It remains blue in basic or neutral solutions