Suppose that a sample of pure water is saturated with gaseious CO2 to form a solution of carbonic acid. which response has the following species arranged in the order of decreasing concentrations at
1. HCO-, H2CO3, CO2-, H+ 33
2. H+, H2CO3, HCO-, CO2- 33
3. H2CO3, H+, HCO-, CO2- 33
4. CO2-, H+, HCO-, H2CO3