1. The problem statement, all variables and given/known data Explain why Na2CO3 gives a basic solution when dissolved in water. 3. The attempt at a solution The cation is Na+ while the anion is CO32-. The cation has no affinity for neither protons nor hydroxide ions. The anion should have basic properties to make a basic solution. Does this mean that HCO3- is a weak acid? I cannot find it in my table of weak acids.