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Reaction Chemistry Initial reaction used: 6HCl(aq) + 2Al(s) 2AlCl 3 (aq) + 3H 2 (g) Final reaction used: HCl(aq) + NaHCO 3(s) CO 2 (g) + H 2 O(l) + NaCl(aq)
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The Group
Reaction Chemistry Initial reaction used:
6HCl(aq) + 2Al(s) 2AlCl3(aq) + 3H2(g)
Final reaction used:HCl(aq) + NaHCO3(s) CO2(g) + H2O(l) +
NaCl(aq)
Calculations 12ml HCl = 0.1452 mol HCl = 0.1452 mol NaHCO2
0.1452 mol NaHCO2 = 12.1975g NaHCO2
Pressure calculated = 4.98672 atm
13ml HCl = 0.1573 mol HCl = 0.1573 mol NaHCO2
0.1573 mol NaHCO2 = 13.2144g NaHCO2
Pressure calculated = 5.4023 atm
Car Design
Testing ResultsTrial
Number HCl (ml) Water (ml)
Baking Soda (g)
Feet traveled
Modi-fications for next
trial
1 13 21 13.220 0 Small wheels
2 13 21 13.220 .5 Wait to open valve
3 13 20 13.222 6 none
4 13 20 13.219 0New
calculations
5 12 15 12.200 0
Wheels attached to axel, new tape on
nozzle of bottle
6 12 15 12.198 24 none-No spew all runs
Performance Results (Wednesday, December 2, 2009)
Trial Number HCl (ml) Water
(ml)Baking
Soda (g)Distance traveled Spew
1 12 15 12.20 17’10” No
2 13 16 13.047 27’5” No
3 12.75 16 12.701 13’0”Some due to hand
fault
4 12.75 16 12.700 25’0” No
Performance Results (Wednesday, December 2, 2009)
25 feet exactly
Performance Results(Friday, December 4, 2009)
Trial Number HCl (ml) Water
(ml)Baking
Soda (g)Distance traveled
1 12.75 16 12.700 18’7”2 12.75 16 12.700 18’5”3 13 16 13.200 15’
No spew all trials
We assume our bottle was starting to wear and could not hold the pressure which we needed to propel our car forward. We tried different caps, but were still losing
some pressure before every run.
Conclusion Our car had a very simple design that allowed us to
attach the bottle to the car quickly and smoothly. The car rolled well, but we still could have tried to find a
way to make the friction of the axel less which would have allowed the car to roll even smoother.
Near the end of the competition our bottle started to leak gas, lessening the pressure. We should have gotten a new bottle and cap to use to ensure that no pressure was lost.
Our car performed better than we expected by reviewing the results in our trial runs. We were very pleased with its performance and making it to the finals.