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6.3.2: Part B

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    Submit all pages of Experiment 6 (Project 2) after completion of pages 3, 4, and 5. Please write your answers neatly and in full sentences since this is a project report. Do not attach pictures to the report.

    Please answer these questions in full sentences based on the procedure, and observations of the project.

    1.     What is the color of the extract from red cabbage in step 3? Estimate the pH of this solutions by comparing with the color standard in canvas. Please take a picture and embed the picture in the Project 2 area.

     

    2.     Complete the following table of observations on the household chemicals. Please write the names of three other solutions in the table below. Observe the color change and predict pH.

    Sample Color Change with Indicator  Predicted pH of the Sample
    Vinegar    
    Carbonated Soda    
    Shampoo solution    
    Baking Soda solution    
    Other 1    
    Other 2    
    Other 3    

     

    3.     Please take picture(s) and embed in the Project 2 area. The cups should be clearly labelled with household solutions used.

    4.     Draw a graph with pH 1-14 on the X-axis and the name of the household chemical used distributed on the y-axis; plot the values for each household chemical clearly on the graph. Please review the references prior to this graph and attach a copy of the graph to your report.

     

     

     

    5, Record the initial and final color of solutions in step 5.

    Initial color and estimated pH of vinegar   ------------------------------------

    Final color and pH (after adding baking soda solution) ----------------------------------    

    6. What other observations did you note during this part of the experiment?

     

     

    7. Write a balanced chemical equation for step 5 of the experiment. Classify the type of reaction involved.

     

     

     

     

    8. For step 5 what unit learning objectives can you reference from unit 1, 2, and 3?

     

     

     

     

    9. Record the initial and final color of solutions in step 6.

    Initial color and estimated pH of tap water    ------------------------------------

    Final color and pH of tap water (after blowing through a straw) -------------------------------

    10. Explain the change in color and pH that occurred when you blew through a straw into water

    in step 6 based on the equation CO2 (g) +   H2O (l)  Eqb sign.png   H2CO3 (aq).

    Use Le Chatelier’s principle and add equilibrium equations necessary to explain.

     

     

     

     

    11. Please reference a unit learning objective from unit 3 that was used to explain step 6 observations.

     

     

    12. Please take before and after pictures of step 5 and 6 and embed in the Project 2 area. The cups should be clearly labeled with the step #.

     

    13. In this experiment, we used red cabbage indicator to test acid and base properties. Is it possible to use other vegetables/fruits/flowers to achieve the same results? List a couple of examples.

     

     

    14. Give one example of applications in health care or daily life of one of the concepts you learned in this topic or this experiment.

     

     

     

     

     

    15. Did you encounter any unexpected result during the experiment? Suggest any changes in procedure to overcome the unexpected result.

     

     

     

     

    6.3.2: Part B is shared under a not declared license and was authored, remixed, and/or curated by LibreTexts.

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