What chemical test could be used to confirm that the gas produced in a chemical reaction is carbon dioxide?

____ The gas generated should be bubbled through a saturated solution of Ba(OH)2 or Ca(OH)2. If a whiteprecipitate forms, the gas is CO2.

____ Checking the pH of CO2 dissolved in water will show it to be a basic solution confirming the presence of CO2.

____ A glowing splint will brighten or burst into flames when thrust into a container of CO2

____ A confirmed mixture of CO2 and air in an inverted test tube will ignite with a "pop' when exposed to a flame.