Tin(II) chloride

Tin(II) chloride (SnCl₂), also called stannous chloride, is an inorganic compound in which tin has oxidation state +2 and bonds with chloride. It acts as a reducing agent and is used in tin plating.

Redox reaction: A chemical reaction in which electrons move between species, changing their oxidation states. Tin(II) chloride reduces other substances by donating electrons as tin(II) is oxidized.
Tin plating: The deposition of a thin tin coating on a surface, often to improve corrosion resistance or solderability. Tin(II) chloride can provide tin ions for depositing protective or functional coatings.
Tin: A metallic chemical element with symbol Sn and atomic number 50. Tin(II) chloride is one compound formed from this element.
Tin(II) sulfate: The tin(II) salt SnSO₄, containing sulfate rather than chloride anions. It supplies tin(II) in sulfate media where chloride’s complexing behavior is unwanted.
Hydrolysis: A reaction in which a substance is transformed through reaction with water. Water can hydrolyze tin(II) chloride, producing basic tin salts unless the solution is acidified.
Chemical reduction: The conversion of a substance to a lower oxidation state through electron gain. Tin(II) chloride serves as a practical electron donor in analytical and synthetic chemistry.
Chloride: The anion Cl⁻, formed when a chlorine atom gains one electron. Two chloride ions balance the +2 charge of tin in SnCl₂.
Tin(II) fluoride: The tin(II) compound SnF₂, used in some dental products to help prevent tooth decay. It shares tin’s +2 oxidation state but has different anion chemistry and major uses.
Complex ion: A charged species consisting of a central metal atom or ion bonded to surrounding molecules or ions. Chloride-rich solutions stabilize tin(II) chloride through dissolved chloro-complexes.
Dyeing: The application of color to fibers or other materials using dyes. Historically, tin(II) chloride has served as a mordant or reducing agent in some dye processes.

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Inert-pair effectBroader topic: The +2 state illustrates tin retaining its 5s pair rather than using all four valence electrons.