What will be the action of the following substances on litmus paper? Dry $HCl$ gas,Moistened $NH_3$ gas,Lemon juice,Carbonated soft drink,Curd,Soap solution.
(N/A) The action of these substances on litmus paper depends on their acidic or basic nature. Acids turn blue litmus red,while bases turn red litmus blue. Dry $HCl$ gas does not show acidic properties because it lacks $H^+$ ions in the absence of water. Moistened $NH_3$ gas acts as a base $(NH_4OH)$. Lemon juice,carbonated soft drinks,and curd are acidic. Soap solution is basic.
| Substance | Action on Litmus paper |
| Dry $HCl$ gas | No change |
| Moistened $NH_3$ gas | Turns red to blue |
| Lemon juice | Turns blue to red |
| Carbonated soft drink | Turns blue to red |
| Curd | Turns blue to red |
| Soap solution | Turns red to blue |
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