Copper(II) sulfate is formed when copper(II) carbonate reacts with dilute sulfuric acid. $\text{CuCO}_3 + \text{H}_2\text{SO}_4 \rightarrow \text{CuSO}_4 + \text{H}_2\text{O} + \text{CO}_2$. Pure copper(II) sulfate crystals are produced. Which reagent is present in excess and by what method are the crystals obtained?
- Acopper(II) carbonate; filter and evaporate the solution to dryness
- Bcopper(II) carbonate; filter, evaporate to crystallising point and then cool
- Cdilute sulfuric acid; evaporate the solution to dryness
- Ddilute sulfuric acid; evaporate to crystallising point and then cool