$$pK_a$$ Values of Common Acids and Functional Groups

Vocabulary flashcards identifying chemical species and functional group $$C-H$$ bonds alongside their characteristic $$pK_a$$ values.

$HCl$ (Hydrochloric acid)

A strong inorganic acid with a $pK_a$ of $-8$.

$H_2SO_4$ (Sulfuric acid)

A strong diprotic inorganic acid with $pK_a$ values of $-3$ and $1.99$.

$H_3O^+$ (Hydronium ion)

The conjugate acid of water, possessing a $pK_a$ of $-1.7$.

$H_2O$ (Water)

A neutral amphoteric solvent with a $pK_a$ of $15.7$.

$NH_3$ (Ammonia)

A basic amine and very weak acid with a $pK_a$ of $35$.

$NH_4^+$ (Ammonium ion)

The conjugate acid of ammonia, possessing a $pK_a$ of $9.2$.

Carboxylic acid (Acetic acid)

An organic carbonyl compound containing a carboxyl group, possessing a $pK_a$ of $4.76$.

Alcohol (Ethanol)

An organic compound containing an aliphatic hydroxyl group, possessing a $pK_a$ of $16$.

Alkane $C-H$ (Propane)

An $sp^3$-hybridized carbon-hydrogen bond in an alkane, possessing a $pK_a$ of $51$.

Vinylic $C-H$ (Propene)

An $sp^2$-hybridized carbon-hydrogen bond directly attached to an alkene double bond, possessing a $pK_a$ of $44$.

Terminal alkyne $C-H$

An $sp$-hybridized carbon-hydrogen bond on an alkyne triple bond, possessing a $pK_a$ of $24$.

Ketone $\alpha$-hydrogen (Acetone)

A carbon-hydrogen bond adjacent to a carbonyl carbon, possessing a $pK_a$ of $19$.

Allylic $C-H$

A carbon-hydrogen bond on a carbon adjacent to a carbon-carbon double bond, possessing a $pK_a$ of $43$.