# Why does hydrochloric acid not dissolve marble chips?

May 6, 2017

$C a C {O}_{3} \left(s\right) + 2 H C l \rightarrow C a C {l}_{2} \left(s\right) + {H}_{2} O \left(l\right) + C {O}_{2} \left(g\right) \uparrow$
Note that marble is a composite mixture of carbonate minerals, and here the composition $C a C {O}_{3}$ is a reasonable approximation. $C a C {O}_{3}$ is fairly insoluble in aqueous solution (most carbonates are!). And hence, if we grind up the marble finely, more surface area is exposed, and thus its reaction with added $H C l$ should be more facile.