Focus: Stoichiometric Calculations, Writing the Background
Experiment 2
Determining Empirical Formulas
Lab Partners: Sebastian Zarazua
Exploration:
Research Question:
What is the empirical formula for the compound made when Mg(s) is heated in air?
Background: (Maximum length 1 page including chemicals equations)
The hypothesis of this experiment is that empirical formula is going to be close to a ratio as 1:1, because that is the theoretical empirical formula for the compound magnesium oxide. Empirical formula is simplest formula for a compound, it is the smallest possible whole- number ratio of subscripts of the elements in the formula. Generally, this the same thing as its simplest molecular formula, this is generally the actual number …show more content…
Once cooled, remove the crucible using tongs and record the mass of the crucible and lid to ± 0.001 g. Do not use your hands to handle the crucible from this point onwards or you will have to fire it again from step 1.
4. Obtain a 0.30 ± 0.01 g magnesium strip (do not handle with your hands). Fold the strip using tongs to fit in the bottom of the crucible.
5. Record the mass of the magnesium strip, crucible and lid to ± 0.001 g.
6. Place the crucible on the clay triangle. Set the lid slightly off-center to allow air to enter but prevent product from escaping.
7. Place the Bunsen burner under the crucible, light it, and brush the bottom of the crucible with a gentle flame for 1 minute; then place the Bunsen burner under the crucible and heat strongly.
8. Heat until all the magnesium turns into a grey-white powder (probably around 10 minutes).
9. Stop heating and allow the crucible, lid and contents to cool.
10. Add about 1 cm3 (~10 drops) of deionized water directly to the solid powder. Carefully waft some of the gas that is generated toward your nose, but be very careful. Record any qualitative results.
Also, use tongs to carefully hold a piece of damp pH paper over the crucible. Record any qualitative …show more content…
How would factors such as:
a. It alters the data that is found in the experiment, what is meant by alter the data is that at the end when the product is weighed we wouldn’t get an accurate result because instead of finding the weight of the oxygen like the question we will be finding the weight of nitride. Meaning that the lab was not done according to the things that are being said. Also instead of finding the weight of one magnesium you will be getting the weight of 3 magnesium atoms
b. This would again alter our data because here instead of finding the weight of only the elements of magnesium and oxygen, we are also finding the weight of hydrogen and adding it to the empirical formula findings. Which is not asked of us. Also we would be finding not only the weight of one hydroxide atom, but 2 because it has bonded with
Experiment 2
Determining Empirical Formulas
Lab Partners: Sebastian Zarazua
Exploration:
Research Question:
What is the empirical formula for the compound made when Mg(s) is heated in air?
Background: (Maximum length 1 page including chemicals equations)
The hypothesis of this experiment is that empirical formula is going to be close to a ratio as 1:1, because that is the theoretical empirical formula for the compound magnesium oxide. Empirical formula is simplest formula for a compound, it is the smallest possible whole- number ratio of subscripts of the elements in the formula. Generally, this the same thing as its simplest molecular formula, this is generally the actual number …show more content…
Once cooled, remove the crucible using tongs and record the mass of the crucible and lid to ± 0.001 g. Do not use your hands to handle the crucible from this point onwards or you will have to fire it again from step 1.
4. Obtain a 0.30 ± 0.01 g magnesium strip (do not handle with your hands). Fold the strip using tongs to fit in the bottom of the crucible.
5. Record the mass of the magnesium strip, crucible and lid to ± 0.001 g.
6. Place the crucible on the clay triangle. Set the lid slightly off-center to allow air to enter but prevent product from escaping.
7. Place the Bunsen burner under the crucible, light it, and brush the bottom of the crucible with a gentle flame for 1 minute; then place the Bunsen burner under the crucible and heat strongly.
8. Heat until all the magnesium turns into a grey-white powder (probably around 10 minutes).
9. Stop heating and allow the crucible, lid and contents to cool.
10. Add about 1 cm3 (~10 drops) of deionized water directly to the solid powder. Carefully waft some of the gas that is generated toward your nose, but be very careful. Record any qualitative results.
Also, use tongs to carefully hold a piece of damp pH paper over the crucible. Record any qualitative …show more content…
How would factors such as:
a. It alters the data that is found in the experiment, what is meant by alter the data is that at the end when the product is weighed we wouldn’t get an accurate result because instead of finding the weight of the oxygen like the question we will be finding the weight of nitride. Meaning that the lab was not done according to the things that are being said. Also instead of finding the weight of one magnesium you will be getting the weight of 3 magnesium atoms
b. This would again alter our data because here instead of finding the weight of only the elements of magnesium and oxygen, we are also finding the weight of hydrogen and adding it to the empirical formula findings. Which is not asked of us. Also we would be finding not only the weight of one hydroxide atom, but 2 because it has bonded with