All Things Chemical and Physical

Chapter 15:

molarity wordle.jpg

All things concentration:

Concentration presentation:         H:\AChem\new book\Ch 15\Concentration.mht

Successive Dilution presentation:  H:\AChem\new book\Ch 15\Successive Dilution2.mht

Beer's Law Presentation:  Beer's Law.ppt

Beer's Law plotting:  (Use these to plot your Beer's Law data, and get the equation of the line.)

S:\jvogus\AccChem\NewText\Chapter 4\concentration\Beer's Law plot absorb only.xlsx

 S:\jvogus\AccChem\NewText\Chapter 4\concentration\Beer's Law plot.xlsx

LAB TEST: Here is the form from the lab test.  (It includes some hints!):  lab test.docx



A Song About Solutions: 

Some Examples: 

-Making a solution from a solid: 

      What mass of sodium chloride (MW = 58 g/mol) is needed to make 100.0 mls of 0.50 M solution?

       First, find the mols of NaCl needed to make the solution:    

                         M = mol/L   so   0.50 mol/1 L  =  x/ 0.100 L

                                                        x = 0.050 mols

      Then, find the mass of the needed mols:  

                    mols = mass/MW    so    0.050 mols = x /58 g/mol

                                                        x = 2.90 g

 -Making a Solution from a Solution:

How many mLs of 0.50 M solution are needed to make 100.0 mLs of 0.20 M solution?

- Find the moles in the "new" solution;   0.20 mol/1 L = x/0.100L

                                                          0.020 mols = x

- Find the mLs of "old" solution that contain 0.020 mols:

                                                          0.50 mol/1 L = 0.020mol/x

                                                           x = 0.010 L or 10.0 mLs

 Titration Information:  Titrations are reactions in which one reactant is added by increments

until the reaction reaches some point of completion.  Once the completion point is reached

stoichiometric relationships can be used. 


C:\Documents and Settings\jvogus\My Documents\My Pictures\titration apparatus.png