# What reaction occurs when calcium carbonate is treated (separately) with (i) nitric acid, and (ii) sulfuric acid?

Mar 4, 2017

Each acid liberates carbon dioxide............

#### Explanation:

$\text{With nitric acid:}$

$C a C {O}_{3} \left(s\right) + 2 H N {O}_{3} \left(a q\right) \rightarrow C a {\left(N {O}_{3}\right)}_{2} \left(a q\right) + C {O}_{2} \left(g\right) \uparrow + {H}_{2} O \left(l\right)$

So we would see fizzing (i.e. the evolution of the gas), and the dissolution of solid carbonate. Calcium nitrate is soluble.

$\text{With sulfuric acid:}$

$C a C {O}_{3} \left(s\right) + 2 {H}_{2} S {O}_{4} \left(a q\right) \rightarrow C a {\left(S {O}_{4}\right)}_{2} \left(s\right) \downarrow + C {O}_{2} \left(g\right) \uparrow + {H}_{2} O \left(l\right)$

Again the gas would be liberated, but calcium sulfate is only very moderately soluble in aqueous media. I would expect to see the solid salt to go up, and then reprecipitate as the sulfate.

Nothing of what I write here is a substitute for actually doing the experiment in a laboratory, and observing and recording the results.