Title: LABPRACTICE 1: “Lavoisier’s Law
Course: Chemist€ry

Now you are going to verify Lavoisier’s Law with your practice

We are going to run our first reaction!!  ♥♥♥

P1. LABPRACTICE 1: “Lavoisier’s Law or Law of mass conservation”

Work in pairs

Goal

Classify different reactions, get used to their inorganic names and formula and verify Lavoisier law.

Could you predict if the reaction of vinegar with baking soda (sodium bicarbonate) will occur? (You will learn more at point 4 of Chemist€ry.II)

Look for the chemical formulas and names (either English than your mother tongue).

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Material ________________________________________________________________________________________________________________________________________________________________________________________________

Procedure

- Weight 4g sodium bicarbonate in a watch-glass. Pour 20 ml of vinegar, with a pipette and pro-pipette, in an Erlenmeyer. Introduce the sodium bicarbonate in a balloon. Weight all together. Record the value (W1).
- Mix the sodium bicarbonate with vinegar and close the Erlenmeyer with the balloon (just like at video^3). Observe. After 5 min, record the weight again (W2).

Results

Your observations and weights.

Write down the chemical equation: with reagents –look for their formulas- and try to predict the products.

Conclusions

Answer the initial goals questions.

Is W1 equal or really close to W2? _______________________________________________________________

Is that related to Lavoisier’s law? Justify your answer_____________________________________________________________

Finally try to balance the chemical equation, what means, to accomplish Lavoisier’s law.___________________________________________________