Zinc Hydroxide Formula

Zinc Hydroxide Formula

Zinc is a chemical element having the symbol Zn and its atomic number is 30. Zinc is a slightly brittle metal at room temperature and turns silvery grey when deoxidised. It is the first element of group 12 (IIB) of the periodic table. A hydroxide is any compound containing one or more groups containing atoms, each of which binds oxygen and hydrogen, acting as a negatively charged ion. The positively charged portion of the compound is typically a metal (e.g. sodium, magnesium or aluminium) ion, although typically it may be an organic group (e.g. guanidine or tetramethylammonium). Zinc hydroxide Zn(OH)2 is known to be an inorganic compound. It also occurs naturally as three rare minerals: wulfenite (orthorhombic), and steatite (all tetragonal).

Zinc Hydroxide Formula (and zinc oxide) are amphoteric, as are the hydroxides of other metals such as lead, aluminium, beryllium, tin, and chromium. Therefore, it is readily soluble in alkaline solutions such as sodium hydroxide and dilutes solutions of strong acids such as HCl.

Structure of Zinc Hydroxide

Zinc Hydroxide Formula exists on earth as a rare natural mineral. It is also an amphoteric white solid that dissolves in solutions of strong acids or strong bases. The Zinc Hydroxide Formula comes in the form of three rare earth minerals such as wulfenite and its formula is Zn(OH)2.

It is prepared by adding a small amount of caustic soda to a solution of zinc salts.

Zn2+ + 2 OH– → Zn(OH)2

Zn2+ forms a tetrahedron with high water concentration at low water concentration, and this reaction is written with water ion and water ion, and the reaction with hydroxide is written with water ion. The donation of protons is shown below.

Zn2+(OH2)4 (aq) + OH– (aq) → Zn2+(OH2)3OH– (aq) + H2O (l)

If added caustic soda, it will remain dissolved when you add caustic. Colourless ionised zinc water:

Zn(OH)2 + 2 OH– → Zn(OH)42-

Zinc is soluble in water because the ions are naturally surrounded by water ligands. When excess sodium hydroxide is added to the solution, the hydroxide ions reduce and dissolve the composition in two steps. Adding excess ammonia forms an equilibrium that gives hydroxide ions. The formation of hydroxide ions leads to a reaction similar to that of sodium hydroxide and is difficult to induce the formation of charged +2 complexes with tetra-coordinated ammonia ligands.

Properties of Zinc Hydroxide

Physical properties of the Zinc Hydroxide Formula can be found on the Extramarks website or mobile application by signing up on the same.

Physical Properties

The density of the Zinc Hydroxide Formula is 3.05 g/cm3 and molar mass of zinc hydroxide is 99.424 g/mol and the melting point of zinc hydroxide is 125 °C (257 °F). The appearance of the Zinc Hydroxide Formula is dull white, fluffy sediment, and odourless. The valence of Zn in zinc hydroxide is 2 and the oxidation state is +2. The pH is 8.88 and zinc hydroxide is sparingly soluble in water and insoluble in alcohol.

Chemical Properties

Aluminium reacts with zinc hydroxide solution to form a white precipitate that dissolves in the excess reagent to form an Al(OH)4 complex, indicating the presence of aluminium.

2Al3++ (aq) + 3Zn(OH)2 (aq) → 2Al(OH)3 (s) + 3Zn

Zinc cations react with hydrogen sulphide in the presence of ammonia and ammonium chloride and form a white precipitate that is of zinc sulphide and Soluble in acid.

Zn2+(aq) + S2 → ZnS

Uses of Zinc Hydroxide

Zinc Hydroxide Formula is used as an adsorbent for pharmaceuticals and as a fixing aid for bandages. Zinc compounds are applied to large dressings used to absorb blood from wounds after surgery. It is useful as an intermediate in industrial processes for pesticides and pigments.

Sample Questions

Question 1: Is zinc hydroxide a salt?

Answer: Under normal conditions, zinc salts dissociate into zinc ions and combine with two hydroxide ions in caustic soda to form zinc hydroxide. These properties of zinc hydroxide are often used to detect the presence of zinc ions in solutions.