All Things Chemical and Physical

Chapter 15: 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

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.

Apparatus: ;