# Conservation of Mass Lab

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• Published : March 14, 2012

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Lab #2
Conservation of Mass

Question:
Will the combined mass of Sodium Bicarbonate (baking soda) and Acetic acid (vinegar) remain the same after they are mixed? Hypothesis:
If vinegar and baking soda are mixed, then the mass of the product will stay the same. Materials:
Ziplock Bag
Watch glass
Baking soda
Vinegar
Electronic lab scale
Pipet
Scupula
Napkins
Procedure:
Place the watch glass on the electronic lab scale
Using the Scupula, scoop out approximately 4g of baking soda onto the watch glass.
Transfer the baking soda to a Ziplock bag
Place a Pipet filled with vinegar into the Ziplock bag
Measure and record the mass of the Ziplock bag filled with the baking soda and vinegar
Squeeze the Pipet to mix the baking soda and vinegar
Measure and record the mass of the Ziplock bag filled with the baking soda and vinegar concoction
Using the data collected find the percent error
Clean area and throw away the Ziplock bag

Data:

Mass of Baking soda – 4.04g
Accepted Value – 14.71g

Mass before reaction – 14.71gExperimental Value – 14.78g Mass after reaction – 14.78gError – -0.07

Calculations:
error=accepted value-experimental value

% error="|error|" /(accepted value)×100%
error = 14.78- 14.71
= -0.07
% error="|-0.07|" /14.78×100%
% error = 0.47%
Discussion:
How did you know that a reaction took place?
I knew a reaction took place because when the baking soda and vinegar mixed together, they began to bubble and fizz. After the fizzing I noticed that it seemed like the bubbles were releasing a gas that in turn began to fill the Ziplock bag.

What do you think your products are?
I believe that the product of the lab was Carbon Dioxide (CO2).

Conclusion:
The mass of the baking soda and vinegar mixture was experimentally proven to be the same mass as the baking soda and vinegar before mixing.