What potential errors (not human) could possibly lead to lost mass of the ppt compared to the theoretical yield in a lab setting?
One potential source of error that could lead to lost mass of the precipitate is that some ppt remains in the previous container. Another potential error is incomplete filtration. If the filter paper is not properly placed in the funnel or if the funnel is not properly supported, some of the precipitate may pass through the filter paper and be lost. This could happen if the filter paper tears or if it is not the correct size for the funnel. Additionally, if the filter paper becomes clogged with precipitate, it may no longer be able to effectively separate the solution from the solid, leading to incomplete filtration and lost mass of the precipitate.
Potential Errors in Lab Filtration Process
1. Residual Precipitate in Previous Container:
When transferring the precipitate to the filter paper, some of it may remain stuck in the previous container. This leftover precipitate means that not all of the intended mass is transferred to the filtration setup, leading to a loss of yield compared to the theoretical value.
2. Incomplete Filtration:
Incomplete filtration can occur due to various factors, impacting the accuracy of the yield. One common issue is the improper placement of the filter paper in the funnel or insufficient support for the funnel itself. If the filter paper is not correctly positioned or tears during the filtration process, some of the precipitate may not be effectively separated from the solution, resulting in a loss of mass.
3. Filter Paper Clogging:
Another potential error that can lead to lost mass of the precipitate is when the filter paper becomes clogged with the precipitate. This clogging prevents proper filtration, as the solid cannot effectively be separated from the liquid solution. When the filter paper is no longer able to perform its function efficiently, the precipitate may pass through along with the liquid, causing a decrease in the yield compared to the expected theoretical value.
In conclusion, ensuring proper handling of the filtration process, including transferring all precipitate to the filter paper, correct placement and support of the funnel, and preventing filter paper clogging, is essential to avoid errors that can result in lost mass of the precipitate during lab experiments.