Jake T., Katie U., Molly M., Rowan H. [please use 12 point font]

Kennon

2ndPeriod Chemistry

August,16, 2018

Blue Bottle Reaction

  1. Observe- For this experiment, we[please use third person past tense language in a scientific paper] wanted to see the chemical reaction of dextrose, sodium hydroxide, and methylene blue when you combine the chemicals togetherwith water. We observed the solution change from a deep blue to clear and observed the number of shakes it took for the solution to change. Also, we observed the liquid change in a certainamountof seconds after the series of shaking.
  1. Hypothesis- If we add Methylene Blue to our solution of tap water, Sodium Hydroxide, and Dextrose, then the solution will change colors and form bubbles when it is shaken.[this “if” “then” statement is a perfect hypothesis!!]
  1. Experiment- For this experiment you will need a scale[Triple beam? Digital? If digital, to what precision? IE to what place value? Tenths? Hundredths?], a weigh boat, a scoopula, a 125 Erlenmeyer Flask, sodium hydroxide, dextrose, and tap water[do you not need a graduated cylinder to measure the volume of solvent? And to what capacity?]. We started by adding 60 mL of tap water[measured with a 100mL graduated cylinder] to our 125 mL Erlenmeyer flask[You started by making sure the lab is free of obstacles such as back packs as they are a fall hazard. Then you donned your safety equipment such as goggles, aprons & gloves (specifically to measure your sodium hydroxide as it is caustic). Students with long hair pulled it back away from the face and dangling jewelry and clothing were addressed so as to avoid contamination and accidents]. Then we added 2 g of Dextrose[did you measure your dextrose? With what equipment? To what precision? (place value)] to our flask using the scoopula, the scale, and the weigh boat. We swirled the Dextrose[maybe the chemical formula cited here?] until it dissolved in the tap water. Once dissolved, we added 1.6 g of Sodium Hydroxide (NaOH). Then we secured our rubber stopper on the flask and swirled the solution until the Sodium Hydroxide dissolved. After dissolving, our instructor added 3 drops of Methylene Blue. We swirled until the whole solution was deep blue. We then shook the solution in a series of three rounds. The first round we shook the solution for 20 seconds and recorded the total amount of shakes. We let it sit for 30 seconds and after, we recorded our observations. In round two, we shook for 20 more seconds and let it sit for 40 seconds. After the 40 seconds, we recorded our observations. By round three we shook it for 20 more seconds and we let it sit for 50 seconds then recorded our observations. After taking our notes from round 3 we let the solution sit for 5 minutes. Once the 5 minutes were up we shook the solution for one final round. In this fourth round we shook it for 20 seconds while recording the number of shakes. Once the 20 seconds were up, we let the solution sit for 30 seconds and recorded our data.
  1. Results-During the first trial, the solution was shaken fifty-four times in twenty seconds. The solution turned to a dark blue and then became clear after sitting for thirty seconds. In the second trial, the flask was shaken forty-five times. While sitting for forty seconds, the solution started as a deep blue then became clear with blue bubbles. The third trail was shaken sixty times and was a royal blue with purple bubbles. After sitting for five minutes the liquid became clear with a blue ring around the top. The blue ring began to run through the clear water in streams. Finally, the solution was shakenfifty-threetimes and became a plain blue with purple bubbles. When sitting for thirty seconds, the liquid again became clear with a blue ring.[this narrative covers excellent quantitative & qualitative data; however, to really make your results section “pop”, a table of data would be awesome!]
  1. Analyze Hypothesis- The results of theexperimentsupportedour hypothesis. We predicted that the solution of tap water, dextrose, and sodium hydroxide will change colors and form bubbles when mixed with Methyleneblue. However, we did not predict that the solution would return to a clear color over time.[so your hypothesis was supported by some evidence and refuted by other data points. You can elaborate on these facts.]
  1. Conclusion- When sodium hydroxide and gluconic acid are together, the gluconic acid turns into sodium gluconate. The Methylene Blue speeds up the reaction “by acting as an oxygen transfer agent.” As the glucose isoxidized [sp]by theoxygen,the methylene blue is reduced creating the clear solution. When shaken, theMethyleneWhiteblue reacts with the sodium gluconate, turning back into Methylene Blue.[this is great coverage on chemical processes and mechanisms!] [the conclusion section of your lab report should also include a concise summary of the experimental procedure as well as the qualitative/quantitative data results that were collected and documented in your lab notebook.]

[on future lab reports, it’s a good idea to compare your group’s data with other group’s data and report those differences and possibly pose an hypothesis as to why there are differences. Maybe there aren’t differences in your data, however. If there are similarities, you can report that as well!]

Work Cited

[this is a nice pic and you might consider embedding a video clip of the process as well]