When making cakes, Na2CO3 or NaHCO3 is often used as leavening agent. Students take a leavening agent and want to explore whether its composition is Na2CO3 or NaHCO3. The design is as follows.

Because both sodium carbonate and sodium bicarbonate can react with hydrochloric acid to release carbon dioxide gas, it is impossible to distinguish whether the expansion agent is sodium carbonate or sodium bicarbonate by adding dilute hydrochloric acid to detect the generated gas. In the second scheme, a comparative experiment was conducted with sodium carbonate. Because the dosage of dilute hydrochloric acid is the same, but the carbon dioxide released when sufficient sodium carbonate and sodium bicarbonate react completely with hydrochloric acid is different, the composition of expansion agent can be judged according to the degree of balloon expansion after the final complete reaction.

So the answer is:

? Whether the target can be achieved explains why the first scheme can't achieve the target, and whether the second scheme can realize the reaction of Na2CO3 or NaHCO3 with hydrochloric acid to release CO2 gas. Through experimental comparison, if the expansion degree of the two balloons is basically the same after the final reaction, it means that the expansion agent is Na2CO3; if not, it means nahco 3.