Zinc-potassium sulfate

Zinc-potassium sulfate
Names:	zinc-potassium sulfate zinc(II)-potassium sulfate zinc-dipotassium sulfate dipotassium hexaaquazinc(II) sulfate potassium zinc schoenite KZnSH KZSH
Formula:	K2Zn(SO4)2 (anhydrous) K2Zn(SO4)2 · 6H2O (hexahydrate)
Molar mass:	335.708 g/mol (anhydrous) 443.797 g/mol (hexahydrate)
Crystal system:	monoclinic (hexahydrate) a=6.151 Å, b=12.194 Å, c=9.044 Åα=90°, β=104.78°, γ=90°
Shapes:	https://en.crystalls.info/w/uploads/media/d/d0/Truncated_deformed_oblique_hexagonal_prism.json Truncated deformed oblique hexagonal prism https://en.crystalls.info/w/uploads/media/9/9a/Truncated_deformed_hexagonal_prism.json Truncated deformed hexagonal prism
Color:	colorless white
Stability:	stable (hexahydrate) hygroscopic (anhydrous)
Hardness:	relatively strong

Description

Inorganic compound, double salt of transitional metal zinc, alkaline metal Potassium and inorganic sulfuric acid. From water solutions crystallizes as hexahydrate.

Precursors

Reaction between zinc and potassium sulfates

Chemical equation:

K₂SO₄ + ZnSO₄ = K₂Zn(SO₄)₂↓

For preparation of 100.00g of zinc-potassium sulfate hexahydrate

hexahydrate

anhydrous

а 64.79g of zinc sulfate heptahydrate

heptahydrate

hexahydrate

monohydrate

anhydrous

and 39.26g of potassium sulfate is required.

Dissolve compounds in hot water apart and then mix solutions into one container with intense stirring. Cooling or evaporation of a solution will cause double salt crystallyzation.

Influence of impurities

Small addition (~10%) of Tutton's salts, like nickel-potassium sulfate, cobalt(II)-potassium sulfate, copper(II)-potassium sulfate or magnesium-potassium chromate can be used to change color of crystals. Adding large amounts of those sales may change crystal shape. It is also possible to cover crystals with a layer of other Tutton's salts, by placing the crystals into s saturated solution of other salt, producing a crystal-in-crystal.

Influence of pH level

Addition of ~1g of baking soda per 100g of solution leads to growing more transparent crystals - impurities form a precipitate, solution should be left for a while and then filtered. Same effect could be achieved by using surfactants. For example, addition of soap containing sodium lauryl sulfate makes crystal transparent and sharp-edged.

Notes

This compound is a good nutrient for molds, so a little amount of food preservative like potassium sorbate might be needed. Boiling after molds appear is also effective.

Storage conditions

Keep in its original form or under several layers of varnish at average humidity and room temperature. Do not keep crystals near heaters.

Solubility

TableGraph

Temperature	g/100,00 g water
45°C318.15 K <br />113 °F <br />572.67 °R <br />	24.5

Gallery

• 

  Growing for a month from solution with baking soda additionZinc-potassium sulfate, Dmitry Shintyakov, Personal crystal growing collectionDmitry ShintyakovPersonal crystal growing collection

• 

  Growing for a month from solution with baking soda additionZinc-potassium sulfate, Dmitry Shintyakov, Personal crystal growing collectionDmitry ShintyakovPersonal crystal growing collection

• 

  Growing for a month from solution with baking soda additionZinc-potassium sulfate, Dmitry Shintyakov, Personal crystal growing collectionDmitry ShintyakovPersonal crystal growing collection

• 

  Growing for a month from solution with baking soda additionZinc-potassium sulfate, Dmitry Shintyakov, Personal crystal growing collectionDmitry ShintyakovPersonal crystal growing collection

Sources

• A. Abu El-Fadl, A. M. Nashaat, Growth, structural, and spectral characterizations of potassium and ammonium zinc sulfate hydrate single crystals
• Personal crystal growing collection

Navigation

Potassium compounds
Salts	Potassium bromate (KBrO3) • Potassium bromide (KBr) • Potassium chlorate (KClO3) • Potassium chloride (KCl) • Potassium chromate (K2CrO4) • Potassium dihydrophosphate (KH2PO4) • Potassium dichromate (K2Cr2O7) • Potassium iodide (KI) • Potassium hydrofluoride (KHF2) • Potassium hydrophosphate (K2HPO4) • Potassium hydrophthalate (KC8H6O4) • Potassium metavanadate (KVO3) • Potassium nitrate (KNO3) • Potassium sulfate (K2SO4) • Potassium thiocyanate (KNCS)
Double salts	Aluminum-potassium sulfate (KAl(SO4)2) • Antimony(III)-potassium tartrate (K2Sb2(C4H2O6)2) • Chromium(III)-potassium sulfate (KCr(SO4)2) • Cobalt(II)-potassium sulfate (K2Co(SO4)2) • Copper(II)-potassium sulfate (K2Cu(SO4)2) • Indium(III)-potassium sulfate (KIn(SO4)2) • Iron(II)-potassium sulfate (K2Fe(SO4)2) • Iron(III)-potassium sulfate (KFe(SO4)2) • Lithium-potassium sulfate (KLiSO4) • Magnesium-potassium sulfate (K2Mg(SO4)2) • Magnesium-potassium sulfate-chromate (K2CrO4 · MgSO4) • Manganese(II)-potassium sulfate (K2Mn(SO4)2) • Nickel-potassium sulfate (K2Ni(SO4)2) • Potassium-sodium tartrate (KNaC4H4O6) • Vanadium(III)-ammonium sulfate (NH4V(SO4)2) • Zinc-potassium sulfate (K2Zn(SO4)2)
Complexes	Potassium dioxalatocuprate(II) (K2[Cu(C2O4)2]) • Potassium hexanitrocobaltate(III) (K3[Co(NO2)6]) • Potassium hexachlororhodiate(III) (K3[RhCl6]) • Potassium hexacyanocobaltate(III) (K3[Co(CN)6]) • Potassium hexacyanoferrate(II) (K4[Fe(CN)6]) • Tripotassium-sodium hexacyanoferrate(II) (K3Na[Fe(CN)6]) • Potassium hexacyanoferrate(III) (K3[Fe(CN)6]) • Potassium hexacyanochromate(III) (K3[Co(CN)6]) • Potassium tetraiodobismuthate (К[BiI4]) • Potassium tetraiodomercurate(II) (K2[HgI4]) • Potassium trioxalatoaluminate (K3[Al(C2O4)3]) • Potassium trioxalatocobaltate(III) (K3[Co(C2O4)3]) Potassium trioxalatoferrate(III) (K3[Fe(C2O4)3]) • Potassium-sodium trioxalatoferrate(III) (K5Na[Fe(C2O4)3]2) • Dipotassium-sodium trioxalatoferrate(III) (K2Na[Fe(C2O4)3]) • Potassium trioxalatochromate(III) (K3[Cr(C2O4)3])