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14 Cards in this Set

  • Front
  • Back
part 1 purpose
to detect co2 through BTB for baking soda and vinegar
part 2 purpose
to detect co2 using BTB for natural and human sources
part 3 purpose
to use a titration test to discover amount of co2 that we collected in the previous parts
BTB
marks the presence of CO2
part 1 materials
-3 test tubes
-test tube rack
-test tube stopper w/tubing attached
-masking tape
-BTB solution
-vinegar
-baking soda
-cotton ball
part 1 procedure
1. use masking tape to write A on one small piece and write on test tube, then B on another test tube. Fill A and B test tubes 1/3 full of BTB
2. Write color of solution in tube A and tube B. Tube A is control, tube B is treatment. Now place tubes in the rack.
3. Fill unlabeled tube about 1/4 full of vinegar
4. Using foil, fold it into a cone puting baking soda in the 'cone' 1/2 full
5. Slide foil cone inside vinegar test tube
6. Put stopper on the tube
7. put other end of straw in tube B, make sure that the tubing reaches the bottom of the tube
8. put a cotton ball into neck of tube B
9. Mix vinegar and baking soda slowly from side to side
10. Wait about a minute and see what color the solutions in A and B are
part 2 materials
-2 ballons (one filled w/car exhaust, and one filled with your breath)
-3 test tubes
-BTB solution
-balloon template
-3 straws
-3 cotton balls
part 2 procedure:air
1. fill one of the balloons up with air, having it's circumference being the same size as the balloon template
2. Tightly twist the tie the balloon at the end
3. Label this as balloon C
part 2 procedure:breath
1. Blow up balloon with your mouth, make the circumference the same size as your balloon template
2. Use a twist tie to hold it tight at the end of the balloon
3. Label this as balloon 'D'
part 2 procedure: car exhaust
1. Fill up a balloon with car exhaust
2. Label this as Balloon E
Part 2 procedure: ALL
1. Place 3 empty test tubes in the rack
2. Label each test tube; C, D, and E using masking tape and a marker
3. Fill each test tube about 1/3 high with BTB solution
4. Insert straw into balloon C at the bottom and hold
5. Insert other end of straw into BTB solution tube C
6. Release air from balloon
7. Note the color change, if any
8. Repeat steps 4-8 with the remaining balloons
part 3 materials
-5 test tubes from parts 1 and 2
-ammonia in a small bottle
-graduated cylinder
-pipette
part 3 procedure: titration
1. Add drops of ammonia into test tube B, count amount of drops until the solution turns back to original color;(blue)
2. Do this for the remaining test tubes.
ALL CO2 LAB RESULTS;titration
A (vinegar): 13 drops
C (breath: 6.5 drops
D (air): 9.16 drops
E (car exhaust):10 drops
*most important to control car exhaust, becuase it contains the most co2 out of these variables