CH 320M: Chem Activity 5C - Acid Base Reactions and pKa
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30 Terms
The smaller the pKa, the _ the acid
stronger
The larger the pKa, the _ the acid
weaker
Acids are defined as strong if
it is easy to rip away their hydrogens
Bases are defined as strong if
they easily take up more hydrogens
When creating arrows, -pKa is
the energy released when a bond forms
When creating arrows, +pKa is
the energy needed to break a bond
To break a bond between Fluorine and Hydrogen it takes
+3 pKa
To form a bond between Fluorine and Hydrogen it releases
-3 pKa
To break a bond between a Nitrogen with 4 R groups it takes
+9 pKa
To form a bond between a Nitrogen with 3 R groups it releases
-9 pKa
To break a bond between an Oxygen with 2 R group it takes
+16 pKa
To form a bond between an Oxygen with 1 R group it releases
-16 pKa
To break a bond between a Nitrogen with 3 R groups it takes
+35 pKa
To form a bond between a Nitrogen with 2 R groups it releases
-35 pKa
To break a bond between two Hydrogens it takes
+40 pKa
To break a bond between two Hydrogens it needs
+40 pKa
To break a bond between Carbon and a Hydrogen it takes
+50 pKa
To form a bond between Carbon and a Hydrogen it releases
-50 pKa
Strong acids have a pKa of _ when breaking bonds
+0 pKa
Strong acids have a pKa of _ when forming bonds
-0 pKa
Strong acids have a pKa equivalent to +0 when breaking bonds because
it is extremely easy to take away Hydrogens from it
Formal charge trumps
electronegativity
Formal charge effect states that an H on a +1 atom is (usually)
more acidic than an H on a neutral atom
The formal charge effect also states that an H on a neutral atom is (usually)
more acidic than an H on a -1 atom
If a hydrogen is more acidic, that means
it is the H that takes the least amount of energy to pull
For a given base, the larger the pKa of the conjugate acid, the _ the base
stronger
For a given base, the smaller the pKa of the conjugate acid the _ the base
weaker
What is the pKa of acetic acid?
5
What is the pKa of C2H2
25
What is the pKa of C6H6O
10
Note 
Flashcards (25)