What is the difference between dissociation and ionisation

A categorisation of the terminological sources of student difficulties when learning chemistry. Studies in Science Education , 55 2 , Selcan Kutucu , Aysegul Tarkin.

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Ionization vs Dissociation. Ionization is the process which produces new charged particles. Dissociation is the separation of charged particles which already exist in a compound. Initial Compound. Ionization involves polar covalent compounds or metals. Dissociation involves ionic compounds. Ionization always produces charged particles. Dissociation produces either charged particles or electrically neutral particles. Ionization process is irreversible.

Dissociation is reversible. Ionization involves covalent bonds between atoms. Dissociation involves ionic bonds in compounds. When an ionic compound is dissolved in water, it is dissociated into its ionic constituents. Figure 2: Acetylsalicylic Acid Dissociation. Dissociation constant is the ratio between the concentrations of products and the reactant concentration after dissociation. This has a constant value if the temperature is constant.

Let us consider an example, water. Dissociation: Dissociation is the breakdown of a substance into smaller particles such as atoms, ions or molecules. Ionization: Ionization is the formation of ions. Dissociation: Dissociation is the formation of small constituents from larger compounds. Ionization: Ionization occurs when an atom or a molecule gains or loses an electron or few electrons.

Dissociation: Dissociation occurs with the addition of solvent and the addition of energy in the form of heat. Ionization: Ionization always forms ions in the end. Dissociation: Dissociation forms atoms, ions or molecules that are smaller than the starting material. Ionization and dissociation basically express the same theory: separation of constituents.