baking soda vinegar stoichiometry lab l.
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Baking Soda/Vinegar Stoichiometry Lab. Materials. Balance Weighing Paper 1 teaspoon of Baking Soda 1 small bottle of vinegar 1 zip lock plastic bag Very large beaker of water. Procedure. Fold weighing paper. Mass it on balance.

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Presentation Transcript
materials
Materials
  • Balance
  • Weighing Paper
  • 1 teaspoon of Baking Soda
  • 1 small bottle of vinegar
  • 1 zip lock plastic bag
  • Very large beaker of water
procedure
Procedure
  • Fold weighing paper. Mass it on balance.
  • Put one teaspoon of baking soda in the weighing paper. Mass it.
  • Subtract the two values to find the mass of the baking soda.
  • Fill the small bottle with vinegar, cap.
  • Put baking soda and vinegar bottle in plastic bag.
  • Empty bag of as much air as possible, seal shut, mass on balance.
  • Estimate the amount of volume of bag.
procedure continued
Procedure Continued
  • With Bag sealed, open bottle of vinegar.
  • Re-mass the bag. Account for any difference in mass from beginning to end.
  • Use large beaker with water to estimate the new volume of the bag.
  • Clean up bottle for next class to use.
  • Throw away plastic bag.
  • Make sure equation is balanced.
  • Figure out what volume of gas was supposed to have been produced using stoichiometry
observations
Observations
  • Mass of weighing paper ___
  • Mass of baking soda plus paper ___
  • Mass of baking soda ___
  • Volume of bag before vinegar was opened ___
  • Mass of bag before opening vinegar ___
  • Mass of bag after opening vinegar ___
  • Volume of bag after vinegar opened ___
  • Estimated volume of gas produced ___
  • Balanced equation for reaction____
  • Full stoichiometry problem for figuring volume of gas.____
equation
Equation

___NaHCO3(s) + ___CH3COOH(l)

___CH3COONa(aq) + ___H2O(l) + ___CO2(g)

use stoichiometry to find liters of gas from grams of baking soda
Use Stoichiometry to find liters of gas from grams of baking soda.
  • Find the molecular weight of NaHCO3
  • Use atomic weights:
  • Na = _____
  • H = _____
  • C = _____
  • O__x3 = ____
  • Molecular weight of baking soda is ___g/mol
the stoichiometry math
The Stoichiometry Math

____ g NaHCO3 x 1 mol NaHCO3

_____ g NaHCO3

___ mol CO2 x 22.4 liters =

___mol NaHCO3 1 mol any gas

= ____ liters of CO2 gas

questions
Questions
  • Give two reasons why it is difficult to get an accurate reading of the volume of the plastic bag before and after.
  • Give some reasons why you didn’t get the volume of CO2 gas that you expected from the stoichiometry math.
questions ii
Questions II
  • Why should the weight, before and after the vinegar bottle is opened, be the same?
  • Give a reason why the mass might have changed, even though it shouldn’t.
  • Give two reasons why might this baking soda reaction might be good to use in your sinks monthly to keep your home plumbing from clogging up?
extra
Extra
  • What are some ways to improve this experiment?
  • What are some additional questions that could be asked for this experiment?