When a solution resulting from a stoichiometric reaction mixture of a sodium hydroxide, NaOH, and an unknown acid, HA is tested with litmus paper, the litmus is blue.
1. Explain why is the litmus blue?
2. Discuss what salt is present from the reaction between the unknown acid and the sodium hydroxide? Write down a balanced equation.
3. Explain which ion of the salt is responsible for the observation of the litmus paper?