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Stoichiometry Lab: Understanding a Chemical Reaction

This lab assignment focuses on understanding a chemical reaction through stoichiometry calculations, data collection, and analysis. Students will calculate molar mass, determine limiting reactants, and predict mass measurements of reactants and products.

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Stoichiometry Lab: Understanding a Chemical Reaction

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  1. Stoichiometry Lab Draw a line separating assignment#1 from #2 SKIP A LINE Write your heading: REMEMBER TO FILL-IN Tuesday 5/3/16 STAMP: Assignment#2: Data/Observation SKIP LINE Data/Observation: UNDERLINE the words Data/Observation: Table#1: Reaction Data for an _________ with the data you recorded SKIP LINE Table# 2:Reation Data for a_______ for you to record data tomorrow 3 LINES

  2. Part 3:Understanding the reaction USE a-g to fill-out the FLOWCHART above! a)The balanced reaction is written on the first line of the chart above. Calculate the molar mass (formula mass) of each of the products and reactants then RECORD on FLOWCHART Line 1. Show your work for one of the compounds! MMNaHCO3 =(____mol Na x____)+( b)One of the products is a gas. Which one? Will this product’s mass contribute to the mass as measured on the balance after the reaction has finished? Why or why not? c)On the second line (added mass), write down the mass of the baking soda and vinegar you added on FLOWCHART and HERE. (taken from Table 1 Step 1-2) mass of NaHCO3=________________________ , mass of HC2H3O2=_________________________ d)Since vinegar is 5% acetic acid, multiply the vinegar mass by its concentration (0.05) to get the actual mass of acetic acid. (Record on Line 4 of FLOWCHART) Show your work!

  3. e) Use the molar mass (formula mass) to calculate the moles of NaHCO3 and HC2H3O2. (Line 5 on FLOWCHART)*GIVEN: mass you measured for NaHCO3 and for HC2H3O2: use the actual substance mass you calculated in 3d. i) ii) f) Use the balance equation to determine how many moles of CO2 were produced. (Record on Line 5 on FLOWCHART) Show your work! *GIVEN: use the moles of limiting reactant calculated from 3e g)Calculate the actual substance mass of CO2 produced in the reaction using the formula mass of CO2. Record on Line 4 on FLOWCHART. Show your work!*GIVEN: use moles of CO2 calculated from 3f h)Now calculate the moles of NaC2H3O2 and H2O and RECORD on Line 5 on FLOWCHART. Show your work! GIVEN: use moles of CO2 calculated from 3f i) ii)

  4. Conclusion Part 4: Stop and think a) How many grams of CO2 were produced in the reaction? b) How does the answer to Part a) explain the mass measurement you found at the end of the experiment? c) Did all the baking soda react? How do you know? d) Did all the acetic acid react? How do you know? e) What was the limiting reactant in this experiment? How do you know?

  5. Part5: Making an efficient reaction a)Calculate the number of moles in 10.0 grams of NaHCO3. b)How many moles of acetic acid are needed to exactly neutralize the baking soda? GIVEN: use moles of NaHCO3 calculated from 5a Use the molar mass (formula mass) to calculate the mass of acetic acid in grams. GIVEN: use moles of HC2H3O2 calculated from 5b c) Divide the mass of acetic acid by 0.05 (since vinegar is 5% acetic acid) to get the mass of vinegar you need (red box). GIVEN: use g of HC2H3O2 calculated from 5c d)Calculate how many grams of CO2 this reaction will produce. GIVEN: use moles of NaHCO3 calculated from 5a e) Predict the total mass of the liquid and solid reactants, and products. This is the mass that will be measured on the balance. g) Fill-in other boxes of flow chart with information you gathered from Part 3.

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