An organic compound, $P$, is in aqueous solution. The solution has a concentration of $0.1\,\text{mol dm}^{-3}$ and a pH of $3$. A solid is then added to the solution and fizzing is observed. Which equation could represent this reaction?
- A$2\text{CH}_3\text{CO}_2\text{H}(aq) + \text{Mg}(s) \rightarrow (\text{CH}_3\text{CO}_2)_2\text{Mg}(aq) + \text{H}_2(g)$
- B$2\text{CH}_3\text{CO}_2\text{H}(aq) + 2\text{Mg}(s) \rightarrow 2\text{CH}_3\text{CO}_2\text{Mg}(aq) + \text{H}_2(g)$
- C$2\text{CH}_3\text{CO}_2\text{H}(aq) + \text{K}_2\text{CO}_3(s) \rightarrow (\text{CH}_3\text{CO}_2)_2\text{K}(aq) + \text{CO}_2(g) + \text{H}_2\text{O}(l)$
- D$2\text{HCl}(aq) + \text{K}_2\text{CO}_3(s) \rightarrow 2\text{KCl}(aq) + \text{CO}_2(g) + \text{H}_2\text{O}(l)$