How many reaction trials are to be completed? are the trials completed sequentially or concurrently? 7. which reaction requires a boiling water bath? which reaction(s) use the centrifuge? 8. in reaction a, students are instructed to add no more than 0.25 ml of 15 m nitric acid. what volume of 15 m nitric acid is required to react with 0.030 g of copper metal? if 1.0 ml of acid contains approximately 20 drops, how many drops of nitric acid are needed? 9. a student uses a 0.0245 g sample of copper wire to perform the copper cycle experiment. if 0.0132 g of dry copper is recovered upon completion of the reaction cycle, calculate the percent recovery of cu.