Making Solutions of Differing Molarity Concentrations

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Presentation transcript:

Making Solutions of Differing Molarity Concentrations Lab Manual 3G

timeline Thursday—Lecture Monday-magic mountain Tuesday—quiz, Perform Lab Thursday—Turn in Lab

Write-up Procedures (include TLABT #3 in procedures) Data --look at my table example to combine the tables to save work --record molecular weight for CuSO4 Data Analysis and Conclusion (1-2 paragraphs) Thinking Like a Biotechnician (#1-4)--#3 must be done in the lab using the spect., #4 can be done on notebook paper

Safety Precautions wear gloves and googles

Prep. for lab 3g Check for cupric sulfate 5-hydrate, glass tubes Set-up spect.

Lab 3G tips Do calculations in advance—show how units cancel When making a solution, the solute is measured out first, and the solvent is mixed into the solute The mass takes up space, solutions are always prepared by raising the solvent to the final volume

Formula for conversions Volume (L) x concentration (mol/L) x molecular weight (g/mol) =___g

Background Periodic table for molecular weight Molarity—expresses concentration Moles/Liter We use lower M solutions (1M or lower) Make sure your total volume is in Liters for conversions!

Molarity: A brief history & explanation What is an atom? How much do atoms weigh?

Hmmm… I propose that there should be something called the “atom.” In 530 BC, Democritus came up with the idea of the atom.

Several years later… Every element is made up of atoms. All atoms of any element are the same. Atoms of different elements are different. In 1808, John Dalton came up with the atomic theory: Atoms of different elements can combine to form compounds. Atoms are not made destroyed or changed. In any compound, the numbers and kinds of atoms remain the same.

So, he used this principle to get relative weights from atom to atom. I may not be a looker, but I am very smart! One liter of Nitrogen will always form with three liters of Hydrogen to form Ammonia (NH3) One liter of Hydrogen will always combine with one liter of Chlorine to make Hydrogen Chloride (HCl) Amadeo Avagadro was working with gases and discovered that when temperature and pressure are the same, gases combine in definite volume ratios. So, he used this principle to get relative weights from atom to atom.

6.02 X 1023 Do you have to know this?