The following quesitons are referring to the experiment \"analyzing copper in br
ID: 857286 • Letter: T
Question
The following quesitons are referring to the experiment "analyzing copper in brass" -- Please explain your answers :) Thank you!
Explain whether each of the following factors would increase, decrease, or not affect the percent copper in the brass sample obtained from your experiment.
1. The mass of the copper wire was recorded incorrectly lower than its actual value. (**we were told to measure 0.7-0.8g of Cu)
2. The mass of the brass was recorded incorrectly larger than its actual value. (**we were given approx. 0.7-0.8g of brass)
3. The copper wire solution was incorrectly diluted to 100 mL instead of 50 mL (The brass solution was still diluted to 50 mL).
4. The copper wire and brass solutions were both diluted to 100 mL instead of 50 mL.
5. A student wet the filter paper with deionized water to hold it in place before filtering the tin (IV) oxide from the brass solution into the cuvette.
6. In the quantitative transfer of the standard copper solution, one drop (0.05 mL) of the solution was lost.
Explanation / Answer
1. When the mass of copper is recorded lower than actual, it indicates less amount of copper is calculated. So percent copper would decrease
2. When mass of brass is recorded larger than usual, the percent copper calculated would increase.
3. A more highly dilute copper solution would indicate low amount of copper than actual. So percent copper would decrease
4. When both were diluted to the same extent, it would not affect the value of percent copper
5. When the filter paper is wet with water, there is no change in the number of ions of tin IV. So it would not affect the value of percent copper
6. When one drop of copper solution is missed, the calculated percent copper will be lower than actual. So it will decrease.
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