Question

$Ca(HC{O}_3{)}_2$ is:

• A. a molecule
• B. a mixture of compounds
• C. an isotope
• D. an isomer
• E. an acid salt

Answer 1

The correct option is E an acid salt

The acid salts have one or more alkali (alkaline earth) metal ions as well as one or more hydrogen atoms. Well known examples are sodium bicarbonate $\left(NaHC{O}_3\right)$, sodium hydrosulfide $\left(NaHS\right)$, sodium bisulfate $\left(NaHS{O}_4\right)$, monosodium phosphate $\left(Na{H}_{2}P{O}_4\right)$, and disodium phosphate $\left(N{a}_{2}HP{O}_4\right)$, calcium bicarbonate $Ca(HC{O}_3{)}_2$. Often acid salts are used as buffers.