Aqueous Salt Solutions - Acid and Base Properties (original) (raw)

Salts contains ions that may affect the pH in aqueous solutions in both acidic and basic directions.

It is possible to predict whether an aqueous solution of a salt with both basic and acidic properties will be basic, acidic or neutral by comparing the Ka value for the acidic ion with the Kb value for the basic ion.

See also Strong and weak acids and bases and Buffer solutions, as well as pKa of inorganic acids and bases, pKa of phenols, alcohols and carboxylic acids and pKa of amines, diamines and cyclic organic nitrogen compounds.

Acid vs. Basic Ion

Ka vs Kb pH Basic or acidic
Ka > Kb < 7 Acidic
Ka < Kb > 7 Basic
Ka = Kb 7 Neutral

This table summarizes the acid-base properties of aqueous solutions of various salts:

For full table - rotate the screen!

Aqueous Salt Solutions - Acid and Base Properties

Type of salt Examples pH of solution Comment
Cation from Anion from
Strong base Strong acid BaCl2, KCl, CaNO3, Na2SO4 Neutral Neither acts as an acid or a base
Strong base Weak acid NaF, KCHOO, NaHCO3 Basic Anion acts as a base Cation has no effect on pH
Conjugate acid of weak base Strong acid NH4Br, NH4NO3, Acidic Cation acts as an acidAnion has no effect on pH
Conjugate acid of weak base Conjugate base of weak acid NH4CN, NH4CH3COO Acidic if Ka > Kb Basic if Kb > Ka Neutral if Ka = Kb Cation acts as an acidAnion acts as a base
Highly charged metal ion Strong acid Al(NO3)3, CrCl3 Acidic Hydrated cations acts as an acidAnions has no effect on pH

My Short List

Properties of gases, fluids and solids. Densities, specific heats, viscosities and more.

Acid and Base pH Indicators

Acid and Base pH Indicators

pH range vs. color change for acid and base indicators - together with pKa and structures of the indicators.

Buffer Solutions

Buffer Solutions

Definitions, explanations and examples of how to make buffer solutions.

Strong and Weak Acids and Bases

The most common strong acids and bases, and some examples of weak acids and bases, together with definition of strong and weak acids and bases.

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