Acids

Introduced to this in AP Chemistry

Refer to Acid-Base Theories if needed

Example of a strong acid solution §

What is the pH of a 0.50 M solution of HCl

HCl H + Cl

0.50 M -> 0.5 M & 0.50 M

pH of the solution is based on the concentration of H

pH = -log[H] = -log(0.50) = 0.30

Example of a weak acid solution §

What is the pH of a 0.50 M solution of acetic acid, HCHO, K = 1.8 * 10

Step # 1: Write the dissociation equation

HCHO CHO + H

Step # 2: Write the equilibrium expression

K =

Step # 3: ICE it

Step # 5.5: Check 5% rule for approximation

HCHO CHO + H

A Weak Acid Equilibrium Problem §

What is the pH of a 0.25 M solution of carbonic acid

HCO H + HCO Ka

HCO H + CO Ka

Step # 1: Write the dissociation equation

HCO H + HCO | Ka

Step # 2: Write the equilibrium expression

K 1 =

Step # 3: ICE it