Why ammonia gas is collected in an inverted gas jar?

Ammonia gas is collected in an inverted gas jar to take advantage of its lower density compared to air. This allows the gas to displace the air in the jar and fill it completely, ensuring an accurate measurement of the gas volume. Additionally, collecting the gas in an inverted jar prevents any leakage or loss of the gas during the collection process. Finally, the inverted jar setup also minimizes the risk of the gas coming into contact with any moisture or impurities present in the surrounding environment, ensuring the purity of the collected gas sample.