# Gas Lab Summer Assignment 2012

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AP Chemistry – At Home Summer Experiment- What a Gas! Your lab notebook entry should be organized as follows (this is how we set up all labs). Underline all section titles. Make sure you put the front flap between sets of pages so you don’t copy your work on several pages. Title: What a Gas: Stoichiometry & Gas Lab Objective: To determine the starting amounts of baking soda and vinegar required to fill up a Ziploc bag. Safety: Don’t eat( Background Info: • Look up the chemical formula for baking soda and vinegar (look online, in your kitchen cabinet, in your textbook, etc) and write them here. • Write the balanced chemical equation for the reaction that takes place between baking soda and vinegar. (There are 3 products produced – one of them is a common gas.) For help, look on p. 50 in the Ultimate Chemical Equations Notebook for a similar reaction. • Discuss briefly how stoichiometry works and give a simple mole to mole example. • Give the Ideal Gas Law and the value of R (0.0821 L atm/K mol) • For extra credit, look up the molecular structure of the pigment in red cabbage and draw it. Prelab Questions (write the question, show all work, box answers): 1. How many moles of hydrogen gas can be produced when 10.0 g of Zn react with excess HCl? (Hint: you must write a balanced chemical reaction first.) 2. If the pressure is 1.2 atm and the temperature is 20.0ºC, what volume of hydrogen is produced in prelab question #1? 3. How many moles of hydrogen gas can be produced when 10.0 g of Zn react with 50.0mL of 2.0M HCl? 4. If the pressure is 1.2 atm and the temperature is 20.0ºC, what volume of hydrogen is produced in prelab question #3? Procedure: 1. Fill your Ziploc bag with water and pour into a measuring cup. Convert from cups to mL and then to L.( ½ cup = 123 mL) This will give you the volume of your Ziploc