Chem 0310/0320: Approximate pKa Values for Select Functional Groups

Vocabulary practice flashcards covering approximate pKa values and functional group representations from Chem 0310/0320.

Acidic Hydrogen

The hydrogen atom(s) drawn in explicitly with the letter $H$ that correspond to the given approximate $pK_a$ values.

$R$ (in this pKa chart)

An $\text{sp}^3\text{-C}$ or $H$.

$$H-X\text{ }(X = Cl, Br, I\text{, or }SO_3R)$$

Strong acids characterized by an approximate $pK_a$ value of $-5$.

$$R-S-H$$

A thiol functional group with an approximate $pK_a$ value of $10$.

$$H-C \equiv N$$

Hydrogen cyanide, which has an approximate $pK_a$ value of $10$.

$$R-O-H$$

An alcohol/water-type functional group with an approximate $pK_a$ value of $15$.

$$H-H$$

Molecular hydrogen, which has an approximate $pK_a$ value of $35$.

$$R-H\text{ }(R = C)$$

An alkane $C-H$ bond, located at the upper limit of the $pK_a$ scale above $45$.