Pre-lab Questions

Pre-lab Questions

  1. The Law of Conservation states that matter cannot be created nor destroyed during a reaction. How does this law apply to this experiment? Briefly explain how we are using this law in our assumptions.

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  1. Consider a saltwater solution at a concentration of 15% w/w. If a student obtained 55.52 g of this solution, how many grams of salt does the student have?

Click or tap here to enter text.

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  1. The student uses the saltwater sample obtained above to perform the reaction below, in the presence of excess fluorine gas. How many grams of chlorine gas are theoretically produced? If 2.31 g of chlorine gas are actually produced, what is the percent yield of this reaction? Show your work for this problem at the end of this worksheet.

NaCl + F2→ NaF + Cl2

Theoretical yield:Click or tap here to enter text.

 

Percent yield:Click or tap here to enter text.

 

 

Calculations/Work

  1. Add a picture of your work for pre-lab question #3 below. Be sure to include units!

 

 

Data

Table 1. “Chemistry volcano” reaction. Complete the following table. Remember sigfigs!

  Data / Calculated Values
Trial 1 Trial 2 Trial 3
Mass of cup, empty (g)      
Mass of vinegar (g)      
Mass of baking soda (g)      
Mass of cup + finished reaction (g)      
Mass of carbon dioxide lost (g)*      
Mass of acetic acid (g)**      
Moles of acetic acid (mol)      
Moles of sodium bicarbonate (mol)      
Theo. yield of CO2 from acetic acid (g)      
Theo. yield of CO2 from sodium bicarbonate (g)      
Percent Yield of CO2      
Average percent yield of CO2  

*Find by subtracting the empty cup + the two reactants from the “mass of cup + finished reaction.”

**Remember! You need to take the 5% w/w into account for mass of acetic acid from your mass of vinegar.

 

 

 

Post-lab Questions

  1. What was the limiting reactant in this experiment?

Choose an item.

  1. What was your average percent yield of carbon dioxide? Show your work for all steps of ONE TRIAL at the end of the worksheet. Make sure all steps are labeled and include units.

Click or tap here to enter text.

  1. List two possible steps where product yield may be lost (why your actual yield was lower than the theoretical yield). Be specific about the steps and explain how they might have affected your yield. (Note: If your yield was above 100%, explain ways this could have happened. If you were lucky enough to get 100% yield, speculate on steps where yield could have been lost).

Way 1:Click or tap here to enter text.

Reason:Click or tap here to enter text.

 

Way 2:Click or tap here to enter text.

Reason:Click or tap here to enter text.

 

Calculations/Work

  1. Add a picture of your work for your theoretical AND percent yield calculations below. Be sure to include units!

 

 

 

 

  1. Add a couple of photos of your experiment below (it’s up to you to decide what to include, but add at least 2-3 pictures).

 

 

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