Litmus — Paper

Standard testing requires careful handling to avoid contamination.

Litmus paper only reacts in the presence of water. To test dry gases (like HClcap H cap C l NH3cap N cap H sub 3 litmus paper

It cannot differentiate between weak and strong acids (e.g., pH 1 vs. pH 3). It is also susceptible to interference from other substances in a solution that might affect the dye's appearance. litmus paper

), the paper must be with distilled water first so the gas can dissolve and produce ions. litmus paper