CHM 1032C

Review for test4

 

 

 I.  Solutions/Molarity

1)       Characteristics 

Solute, solvent, saturated, electrolyte, colloid, suspension

2) Concentrations

·         w/w %

·         Molarity        

M V = moles          (Remember the question: How do you make 2L of 1M NaOH?)

3) Dilutions

                                               

(Remember the question: How do you make 2L of 1M HCl from 12 M HCl?)

 

II.  Reaction rates and Equilibria

                1) Thermodynamics vs. kinetics

                2) 3 ways to increase the rate of the reaction

                3) Energy diagram

transition state, activation energy, reactants, products, reaction coordinate

                4) How a catalyst works- (decrease activation energy)

                5) Equilibrium constants

                6) Le Châtelier’s principle

 

III. ACIDS AND BASES

1) What is an acid?  What is a base? (Arrhenius)

2) What is an acid?  What is a base? (Brønsted-Lowry)

3) How do you measure acidity?  (pH)

4) What is the [H+] given the pH?

5) What is the [OH-] given the pH?

6) Why isn’t the pH of 0.1M CH3COOH not 1?

7) Why is the pH of NH3 basic?

8)  Will an acid/base reaction occur?

9) What is a buffer solution and how does it keep the pH constant?


 

 

Equilibrium reactions

               aA + bB  <==>  cC + dD

 

 

              

 

 

 

pH equations

 

pH= -log[H+]            [H+] = 10-pH   

 

pOH=-log[OH-]       [OH-]=10-pOH

 

pH + pOH= 14       [H+] [OH-]= 10-14


 

 

Strong acid                                                                                                                           weak acid

acid         HCl         HNO3     H3O+      CH3COOH             H2CO3   HCO3-     NH4+     H2O        NH3

               

base         Cl-           NO3-      H2O        CH3COO-               HCO3-    CO32-       NH3       OH-         NH2-

weak base                                                                                                                             Strong base