Qualitative inorganic analysis
Qualitative inorganic analysis identifies inorganic ions or compounds in a sample through characteristic reactions, without measuring their amounts.
Analytical chemistry: The study of methods for identifying and measuring the chemical composition of materials. Qualitative inorganic analysis is its identification-focused branch.
Acid–base reaction: A reaction involving transfer of a proton or, more broadly, electron-pair interactions between acids and bases. Acidity controls precipitation, dissolution, and the forms of many inorganic ions.
Qualitative cation analysis: The identification of positively charged ions through characteristic chemical tests. Classical schemes organize metal-ion identification into successive groups.
Quantitative analysis: The determination of how much of a substance is present in a sample. It measures amounts, whereas qualitative inorganic analysis establishes identity.
Precipitation reaction: A reaction in solution that produces an insoluble solid from dissolved substances. Selective precipitates reveal ions through their formation, color, or solubility.
Oxidation–reduction reaction: A chemical reaction involving electron transfer and changes in oxidation state. Redox tests identify ions through characteristic changes in oxidation state and color.
Qualitative anion analysis: The identification of negatively charged ions through characteristic chemical tests. Anion tests use distinctive precipitation, gas formation, and redox reactions.
Instrumental analysis: Chemical analysis based on measurements made with instruments such as spectrometers or chromatographs. Instrumental methods often identify ions without relying on classical wet-test sequences.
Solubility equilibrium: The dynamic balance between a sparingly soluble solid and its dissolved ions. Solubility differences determine which ions precipitate under a given set of conditions.
Chemical equilibrium: A state in which forward and reverse reaction rates are equal, leaving concentrations constant. Equilibria explain why test outcomes depend on reagent amounts and solution conditions.