- Taste: Sour.
- Touch: Like water.
- Tested with litmus paper: Turn blue litmus red.
- pH value: From 0 to less than 7.
- Reaction with metals: Form hydrogen and a salt.
- Reaction with carbonates: Form a salt, water and carbon dioxide.
- Reaction with ammonium compounds: No reaction.
Alkalis
- Taste: Bitter.
- Touch: Soapy.
- Tested with litmus paper: Turn red litmus blue.
- pH value: From above 7 to 14.
- Reaction with metals: No reaction.
- Reaction with carbonates: No reaction.
- Reaction with ammonium compounds: Give off ammonia gas.
(Natasha Aleia)