Determine the oxygen content in the air. What effect does copper wire play?
Data analysis and determination of residual gas is greater than 24mL, the remaining 24mL caused this difference is mainly due to the following reasons: copper wire is too small, the reaction time, heating temperature is not enough, not alternating slowly pushing two syringe piston, adding copper deficiency and not completely consumed oxygen readings without cooling to room temperature. Can cause the difference of data;
The observed phenomena are: during the heating, copper reacts with oxygen to form copper oxide, so it can be seen that the red copper wire gradually turns black; the volume of the gas decreases by about 1/5
The copper wire acts as a reaction to oxygen in the airIn order to accurately measure the volume fraction of oxygen in the air, only the amount of copper wire used is sufficient to completely deplete the oxygen in the air in the sealed syringe.
