# How would we represent the reaction of "magnesium bicarbonate" with "hydrochloric acid"?

Are you asking how many equiv of acid we add to neutralize $M g {\left(H C {O}_{3}\right)}_{2}$?
$M g {\left(H C {O}_{3}\right)}_{2} \left(a q\right) + 2 H C l \left(a q\right) \rightarrow M g C {l}_{2} \left(a q\right) + 2 C {O}_{2} \left(g\right) + 2 {H}_{2} O \left(l\right)$
$H C {O}_{3}^{-} + {H}_{3} {O}^{+} \rightarrow C {O}_{2} \left(g\right) \uparrow + 2 {H}_{2} O \left(l\right)$