A separate reaction is carried out for each of three dilute acid solutions, all having a concentration of $0.01\,\text{mol dm}^{-3}$, with excess calcium carbonate, and the reaction is allowed to continue until no more reaction occurs. The same volume of acid is taken in every case. The carbon dioxide given off is collected, and its volume is recorded. Every measurement is made at room temperature and pressure. The results are: Acid 1: $\text{pH} = 2.0$, volume of carbon dioxide produced $= 20\,\text{cm}^3$ Acid 2: $\text{pH} = 1.7$, volume of carbon dioxide produced $= 40\,\text{cm}^3$ Acid 3: $\text{pH} = 3.4$, volume of carbon dioxide produced $= 20\,\text{cm}^3$ What are the possible identities of the acids?
- Aacid 1: hydrochloric; acid 2: sulfuric; acid 3: ethanoic
- Bacid 1: hydrochloric; acid 2: nitric; acid 3: ethanoic
- Cacid 1: nitric; acid 2: sulfuric; acid 3: hydrochloric
- Dacid 1: sulfuric; acid 2: hydrochloric; acid 3: nitric