Question

CaCO3 + 2HCl[dil.] → CaCl₂ + H₂O + CO₂ [g]

State the information provided by the above chemical equation.

Answer 1

Information provided by the equation:

CaCO₃ + 2HCl[dil.] → CaCl₂ + H₂O + CO₂ [g] are that 

1. Calcium carbonate reacts with [dil.] hydrochloric acid to produce calcium chloride, water and Carbondioxide.
2. One molecule of calcium carbonate reacts with two molecules of acid to produce one molecule of calcium chloride, one molecule of water and one molecule of carbondioxide.
3. About the chemical composition of respective, molecules like one molecule of calcium chloride contains one atom of calcium, one atom of carbon and three atoms of oxygen.
4. Molecular masses
   \[\ce{\underset{\text{173    = }}{\underset{\text{100  +}}{\underset{\text{[40+12+(3×16)]}}{CaCO3}}+\underset{\text{73}}{\underset{\text{2[1+35.5]}}{2HCl}}}->\underset{\text{173}}{\underset{\text{111  +}}{\underset{\text{40+(2×35.5)}}{CaCl2}} + \underset{\text{18  +}}{\underset{\text{2×1+16}}{H2O}}+\underset{\text{44}}{\underset{\text{12+2×16}}{CO2}}}}\]
   that 100 parts by weight of calcium carbonate reacts with 73 parts by weight of hydrochloric acid to produce 111 parts by weight of calcium chloride 18 parts by weight of water and 44 parts by weight of carbon dioxide.
5. That reaction is irreversible.
6. That about the state of substances present i.e. solid, liquid or gas.