Three students are asked to discuss the percent error obtained from this lab and explain some sources of error that would account for the discrepancy seen, if any.Which student employs correct scientific reasoning? Student 1: If the reaction was not allowed to go to completion the sodium bicarbonate would not have fully decomposed , making the final mass higher than the theoretical. Student 3: The student didn't weigh the masses correctly therefore human error is the main source of discrepancy. Student 2: If the baking soda was not heated long enough, the final mass of solid product would be low.

Question

Three students are asked to discuss the percent error obtained from this lab and explain some sources of error that would account for the discrepancy seen, if any.Which student employs correct scientific reasoning? Student 1: If the reaction was not allowed to go to completion the sodium bicarbonate would not have fully decomposed , making the final mass higher than the theoretical. Student 3: The student didn't weigh the masses correctly therefore human error is the main source of discrepancy. Student 2: If the baking soda was not heated long enough, the final mass of solid product would be low.

Answer 1

Student 2 employs correct scientific reasoning. If the baking soda was not heated long enough, the reaction would not go to completion, resulting in a lower final mass of the solid product. This would account for the discrepancy seen in the percent error.

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