hydrogen gas
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1. acid/base 2. protolysis 3. reversible proton exchange 4. .... reactions
When a carbonate reacts with an acid, it forms a salt, carbon dioxide gas, and water. The general chemical equation for this reaction is: carbonate + acid → salt + carbon dioxide + water. This reaction is a type of double displacement reaction, where the carbonate ion (CO3 2-) from the carbonate compound reacts with the hydrogen ion (H+) from the acid to form water and carbon dioxide gas, leaving behind a salt.
Hydrochloric acid and sodium hydroxide yield salt and water H+ + Cl- + Na+ + OH- --> Na+ + Cl- + H2OComment:In solutions you better leave unchanged ions ( Cl- and Na+) out of the balanced equation: called to be 'tribune ions' (people on the tribune don't take part in the 'match'):H+ + OH- --> H2O This looks simpler than: H+ + Cl - + Na + + OH- --> Na + + Cl - + H2O
Not by itself. A cup of salt may be a fraction of the total amount of salt in the world, but just sitting there, a cup of salt is a cup of salt.
It depends on how thinly the salt is spread.