An unknown solid compound is analyzed in the lab to determine its chemical formula. The following observations are recorded.
• When a small quantity of the solid is heated in the flame of a Bunsen burner, a bright orange flame is observed.
• A quantity of the solid is added to water and the solid dissolves.
• When aqueous sodium hydroxide is added to a small amount of the unknown solution there is no visible change to either solution.
• The addition of aqueous barium nitrate to a small volume of the unknown solution results in the formation of a white precipitate.
• The addition of dilute hydrochloric acid to the tube containing the precipitate causes the precipitate to disappear and bubbles of a gas are observed in the tube.
• The addition of aqueous silver nitrate to a volume of the unknown solution causes no visible change.
What is the chemical formula of the original unknown compound?
Write all appropriate chemical equations to justify your answer to the previous question. (net ionics)