Zinc hydroxide

Zinc (II) - hydroxide

Colorless, odorless powder

Fixed

3.05 g · cm -3

125 ° C

Sparingly soluble in water

Attention

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Zinc hydroxide is a chemical compound selected from the group of the hydroxides by the formula Zn (OH ) 2 It is a non-flammable, colorless and odorless powder which is sparingly soluble in water.

Occurrence

Zinc hydroxide occurs naturally in three rare minerals. Wülfingit ( orthorhombic ), Ashoverit and Sweetit (both tetragonal). This results further in the discharge in the alkaline manganese batteries is one of the main components of white rust.

Production and representation

Zinc hydroxide can be obtained by reaction of zinc ( II) chloride with sodium hydroxide.

General falls zinc hydroxide as a gelatinous mass from solutions containing both Zn2 and (OH ) - ions included. This is used for the detection of zinc cations.

Properties

Zinc hydroxide (how many metal hydroxides ) slightly soluble in water. It is an amphoteric hydroxide, ie both in acidic and soluble in alkaline medium. In acids it dissolves with the formation of [Zn (H2O ) 6] 2 ions in concentrated bases to form Hydroxozinkat ions [ Zn ( OH) 4] 2 -. It has an orthorhombic crystal structure with space group P212121 (a = 5.17 Å, b = 8.55 Å, c = 4.93 Å), but five other crystalline forms exist, but they are unstable and under standard conditions in zinc hydroxide (more precisely, ε - zinc hydroxide ) pass. The theoretically resulting in the dissolution of zinc hydroxide and oxo Hydroxosäuren of zinc are called zincates.

Use

Zinc hydroxide can be used to produce zinc oxide.

Related compounds

• Zinkhydroxidchlorid Zn (OH ) Cl
• Zinkhydroxidphosphat Zn2 ( OH) PO4