Acidity constant

The acidity constant, often called pKa, measures how easily a substance (like an acid) gives up a proton (H⁺) in water. A low pKa means the acid readily releases protons, making it stronger, while a high pKa indicates a weaker acid that holds onto its protons more tightly. Think of it as a way to quantify and compare how different acids behave in solutions, helping chemists understand their strength and how they might react in various chemical processes.