Quiz Reflection

Our final lecture of the unit aqueous solutions was how to tie molarity to our stoichometry calculations we have learned in previous units. It seems like all of chemistry somehow leads back to Stoich... Anyways, we learned how to find grams, volume, moles, or molarity of a substance, using molarity (mol per 1L) as a conversion factor. We can use molarity to get from volume to moles, and then subsequently from moles to grams, and vice versa.

https://www.course-notes.org/chemistry/topic_notes/aqueous_solutions_and_solution_chemistry/solution_concentrationstoichiometry

Murder Lab Day 2

Day Two consisted of weighing the dry filter paper that contained the solid from the reaction. The solid was a pea green powder. After weighing the filter paper, we subtracted this mass from the mass of just the filter paper to figure out the mass of the solid. Then, we calculated the molarity of this substance and found out that it was roughly 0.07 M. To figure out the identity of the unknown substance, we knew that it must have been silver nitrate because when silver nitrate combines with sodium carbonate, it should make a solid, which is exactly what happened in lab. The 0.07 molarity matched Mr. Green's description, as he was found with traces of silver nitrate with a molarity between 0.05 and 0.15 M.

Murder Lab Day 1

The murder lab is a lab where we solve a murder using chemistry. Today's task was combining an unknown solution with sodium carbonate in a beaker. Both reactants were clear, but when combined, the product was a milky white substance. Then, we poured this substance into a funnel with filter paper inside an empty Erlenmeyer flask to collect any solid. While letting the liquid drip down into the flask, I noticed there was a sand-like substance forming inside the liquid, showing that the reaction definitely produced a solid. Thus, it can be inferred that the unknown substance is silver nitrate, due to the fact that it should produce a solid when reacted with sodium carbonate based on solubility rules.