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Acids, Bases & Salts

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Acids, Bases & Salts

Relationship between Ka and Kb

The reciprocal link between the strengths of an acid and its conjugate base.

Ka × Kb = Kw Dimensionless
Acids, Bases & Salts

Salt

An ionic compound formed when the hydrogen of an acid is replaced by a metal or other cation.

acid + base → salt + water Dimensionless
Acids, Bases & Salts

Salt Hydrolysis

The reaction of a salt's ions with water to produce an acidic or alkaline solution.

A⁻ + H₂O ⇌ HA + OH⁻ mol/L
Acids, Bases & Salts

Self-Ionisation of Water

The reaction in which two water molecules transfer a proton to give a hydronium and a hydroxide ion.

2H₂O ⇌ H₃O⁺ + OH⁻ mol/L
Acids, Bases & Salts

Stepwise Ionisation

The successive loss of protons from a polyprotic acid, each governed by its own equilibrium constant.

Ka₁ ≫ Ka₂ ≫ Ka₃ mol/L
Acids, Bases & Salts

Strong Acid

An acid that ionises essentially completely in aqueous solution.

HA → H⁺ + A⁻ (complete) mol/L
Acids, Bases & Salts

Strong Base

A base that dissociates or ionises completely in aqueous solution to give hydroxide ions.

BOH → B⁺ + OH⁻ mol/L
Acids, Bases & Salts

Superacid

An acid stronger than pure sulfuric acid, capable of protonating species normally regarded as completely non-basic.

H₀ < −12 Dimensionless
Acids, Bases & Salts

Titration

A quantitative technique in which a solution of known concentration is added to another until the reaction between them is exactly complete.

n₁ / n₂ = a / b mol/L
Acids, Bases & Salts

Titration Curve

A plot of pH against the volume of titrant added during an acid–base titration.

Dimensionless
Acids, Bases & Salts

Weak Acid

An acid that ionises only partially in aqueous solution, establishing an equilibrium with its conjugate base.

HA ⇌ H⁺ + A⁻ mol/L
Acids, Bases & Salts

Weak Base

A base that accepts protons only partially in aqueous solution, establishing an equilibrium.

B + H₂O ⇌ BH⁺ + OH⁻ mol/L