Chem 0310: Problem Set 4 - pKa Reference Table

Vocabulary practice flashcards covering the pKa values of key organic functional groups and inorganic acids from Chem 0310: Problem Set 4.

Hydrohalic Acids ($HX$, where $X = Cl, Br, I$)

Strong inorganic acids with an approximate $pKa$ of $-5$.

Protonated Oxygen ($R-\overset{+}{O}H_2$)

Protonated alcohol or water species with an approximate $pKa$ of $0$.

Carboxylic Acid ($R-COOH$)

An organic acid containing a carboxyl group, with an approximate $pKa$ of $5$.

Protonated Aniline Derivative ($R-N^+H_2-Ph$)

An aromatic ammonium ion with an approximate $pKa$ of $5$.

Hydrofluoric Acid ($H-F$)

An inorganic acid with an approximate $pKa$ of $5$.

Protonated Trialkylamine ($R_3N^+H$)

A protonated tertiary ammonium ion with an approximate $pKa$ of $10$.

Phenol ($Ph-OH$)

An aromatic hydroxy compound with an approximate $pKa$ of $10$.

Thiol ($R-SH$)

An organosulfur compound containing a sulfhydryl group, with an approximate $pKa$ of $10$.

Hydrogen Cyanide ($H-C\equiv N$)

A compound containing a cyano group, with an approximate $pKa$ of $10$.

Alcohol / Water ($R-OH$)

A neutral oxygen compound ($R = H$ or $sp^3$ carbon) with an approximate $pKa$ of $15$.

Ketone $\alpha$-Hydrogen ($R-C(=O)-CH_2-H$)

An acidic hydrogen located on the carbon adjacent to a carbonyl group, with an approximate $pKa$ of $20$.

Terminal Alkyne ($R-C\equiv C-H$)

An alkyne containing a hydrogen bonded to an $sp$-hybridized carbon, with an approximate $pKa$ of $25$.

Amine ($R_2N-H$)

A neutral amine hydrogen with an approximate $pKa$ of $35$.

Molecular Hydrogen ($H-H$)

Diatomic hydrogen gas with an approximate $pKa$ of $35$.

Alkane ($R-H$)

A hydrocarbon C-H bond ($R = H$ or $sp^3$ carbon) with an approximate $pKa$ of $45$.

Chem 0310 pKa Reference Table

A reference table displaying common organic functional groups and inorganic acids along with their corresponding $pKa$ values ranging from $-5$ to $45$.