Acid Base Reactions

 We learned about acid base reactions with strong acids and strong bases.

-Strong acids (SA) dissociate to produce H+ ions 

-Strong bases (SB) dissociate to produce OH- ions

-When a SA and SB are reacted with each other they form water and an ionic salt

-acid-base reactions always produce salt and water

NaOH(aq) + HCl(aq) —> NaCl(aq) + H₂O 

PH and pOH
-PH is a measure of the hydrogen ions present in a solution.
PH= -log[H+]
-pOH is a measure of the hydroxide ions present in a solution.
pOH= -log[H-]

Example:
150mL of .300M HCl is added to 250mL of .200M LiOH
Balanced equation: HCl + LIOH -> HOH + LiCl
                                                                                            
-Determine the L.R
.300mol x .150L = .0450 mol given
     L
.200mol x .250L x 1 = .0450 needed
    L                       1
L.R is HCl
                                                                                           
How much LiOH is left over after the reaction is complete.
.250L x .200mol = .0500 mol LiOH started with
                  L
.0450mol x 1 = .0450mol used
  (^of HCl given)1
(.0500) - (.0450) = .0050 mol of LiOH left over
                                                                                          
-Determine [LiOH] after the reaction is complete.
.0050mol x   1   = .0125M
                 .400L
[LiOH]= .0125M
                                                                                         

-Find the pOH of the final solution.
     LiOH -> Li+ + Li-
remember pOH = -log[OH-]
    so         pOH= -log(.0125)