Chem and society lab report 5 and 6

Chem and society lab report 5 and 6 - Lisa Elina binti...

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Lisa Elina binti Shahnor (15031818) Lab Report Experiment 5 Title: Down the Drain Aim: To identify what happens in a situation where decomposition is occurring. Procedure:- 1) Label six clean test tubes. Prepare 5 mL of milk/water solutions at the following concentrations given and place into the test tubes. Concentration Milk (mL) H 2 O (mL) 100% 5 0 50% 2.5 2.5 33% 1.65 3.35 20% 1 4 10% 0.5 4.5 0% 0 5 2) Add 2 mL methylene blue solution into each of the test tubes using a graduated pipette and mix thoroughly. 3) A member of the team is assigned the task of time-keeping and another member is assigned to transfer the yeast suspension. To keep cells evenly suspended, swirl the beaker of yeast suspension before drawing 5 mL of it using a graduated pipette. The moment the yeast suspension is added into the test tube 1, the timekeeper starts the time watch. 4) Once the content of the tube shows a color change, stop the stopwatch. Note down the time taken for a color change to occur in the table provided. 5) Repeat step 3 and 4 for the rest of the remaining test tubes. Results:- Milk Concentratio n (%) 100 50 33 20 10 0 Elapsed Time (s) 69 17 5 3 1.5 1 Discussion:-
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1. Correlation between milk concentration in the mixture and elapsed time is shown below: 0 20 40 60 80 100 120 0 10 20 30 40 50 60 70 80 Milk concentration (%) Elapsed time (s) 2. Example: Experimen t Concentration of Methylene Blue Concentratio n of Yeast Concentratio n of Milk 1 0.1 g/L 2 g/40 mL 100% 2 0.1 g/L 4 g/40 mL 100% 3 0.2 g/L 2 g/40 mL 100% 4 0.1 g/L 2 g/40 mL 50% 5 0.1 g/L 4 g/40 mL 50% i.
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