How is pKa different from pH?

pKa

• Is defined as the negative value of the logarithm of Ka
• Indicates whether an acid is a weak or strong acid
• High pKa of an acid indicates that it is a weak acid, while low pKa indicates that it is a strong acid
• Is dependent on the concentration of H+ ions, acid concentration, and conjugate base

pH

• Is defined as the logarithmic value of the inverse of H+ concentration
• Indicates whether a system is acidic or basic
• High pH value above 7 indicates a basic solution, while low pH value below 7 indicates an acidic solution
• Is dependent on concentration of H+ ions