16: Acids and Bases

Acids and bases are important classes of chemical compounds. They are part of the foods and beverages we ingest, they are present in medicines and other consumer products, and they are prevalent in the world around us. In this chapter, we will focus on acids and bases and their chemistry.

• 16.01: Arrhenius Acids and Bases
An Arrhenius acid is a compound that increases the H+ ion concentration in aqueous solution. An Arrhenius base is a compound that increases the OH− ion concentration in aqueous solution. The reaction between an Arrhenius acid and an Arrhenius base is called neutralization and results in the formation of water and a salt.
• 16.02: Brønsted-Lowry Acids and Bases
A Brønsted-Lowry acid is a proton donor; a Brønsted-Lowry base is a proton acceptor. Acid-base reactions include two sets of conjugate acid-base pairs.
• 16.03: Strong and Weak Electrolytes
• 16.04: Strong and Weak Acids and Bases and their Salts
Strong acids and bases are 100% ionized in aqueous solution. Weak acids and bases are less than 100% ionized in aqueous solution. Salts of weak acids or bases can affect the acidity or basicity of their aqueous solutions.
• 16.05 Autoionization of Water
In any aqueous solution at room temperature, the product of $$[H^+]$$ and $$[OH^−]$$ equals $$1.0 \times 10^{−14}$$.
• 16.06 The pH Scale
pH is a logarithmic function of [H+]. [H+] can be calculated directly from pH. pOH is related to pH and can be easily calculated from pH.
• 16.07: Buffers
A buffer is a solution that resists sudden changes in pH.