Name: Section Number: A . Problem Set for Balloon Chemical Reaction What activity do you observe in the balloon after vinegar (acid) and baking soda (base) are mixed? What chemical product is causing the balloon to blow up? 2. Do you think this is a reversible or an irreversible reaction? Why? (Think about where the reactants and products end up) Answer the questions below (highlight or circle your answers), again using the Law of Mass Action to explain how decreasing the [CO2] led to a pH change: CO2 + H2O ?(#1) H2CO3 ?(#2) H+ + HCO3- Step 1. The increase in [CO2] by shaking caused reaction #1 to shift to the LEFT / RIGHT, and that caused… Step 2. a(n) INCREASE / DECREASE in [H2CO3], and that caused… Step 3. Reaction #2 to shift to the LEFT / RIGHT, and that caused Step 4. a(n) INCREASE / DECREASE in [H+], and that caused Step 5. a(n) INCREASE / DECREASE in pH. B . Problem Set for Flat Sprite Beverages are carbonated because they contain CO2. This makes pops pretty acidic (as you perhaps saw in lab #2 if you chose to measure pop, and keep hearing about in the American Dental Association ad campaigns), because the CO2 reacts with H2O to form carbonic acid. In closed containers, the CO2 gas stays in solution, but when you open the can and pour out the pop the CO2 slowly escapes. Over time the pop will go “flat”. By shaking, you accelerated that process. 1. What was the Initial color and pH range of your pop: 2. What was the Final color and pH range of your pop: Answer the questions below (highlight or circle your answers), again using the Law of Mass Action to explain how decreasing the [CO2] led to a pH change: CO2 + H2O ?(#1) H2CO3 ?(#2) H+ + HCO3- Step 1. The decrease in [CO2] by shaking caused reaction #1 to shift to the LEFT / RIGHT, and that caused… Step 2. a(n) INCREASE / DECREASE in [H2CO3], and that caused… Step 3. Reaction #2 to shift to the LEFT / RIGHT, and that...
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