Potassium hexafluorophosphate

{{chembox

| Verifiedfields = changed

| Watchedfields = changed

| verifiedrevid = 464211843

| ImageFile = Potassium hexafluorophosphate.png

| ImageSize = 150px

| IUPACName = Potassium hexafluorophosphate

| OtherNames =

|Section1={{Chembox Identifiers

| ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}}

| ChemSpiderID = 146640

| EC_number = 241-143-0

| InChI = 1/F6P.K/c1-7(2,3,4,5)6;/q-1;+1

| InChIKey = YZDGRYDIGCWVND-UHFFFAOYAC

| StdInChI_Ref = {{stdinchicite|correct|chemspider}}

| StdInChI = 1S/F6P.K/c1-7(2,3,4,5)6;/q-1;+1

| StdInChIKey_Ref = {{stdinchicite|correct|chemspider}}

| StdInChIKey = YZDGRYDIGCWVND-UHFFFAOYSA-N

| CASNo_Ref = {{cascite|correct|CAS}}

| CASNo = 17084-13-8

| UNII_Ref = {{fdacite|correct|FDA}}

| UNII = 88W436PDI9

| PubChem = 23688904

| SMILES = [K+].F[P-](F)(F)(F)(F)F

}}

|Section2={{Chembox Properties

| Formula = K[PF₆]

| MolarMass = 184.0625 g/mol

| Appearance = colourless solid

| Density = 2.75 g/cm³

| MeltingPtC = 575

| BoilingPt =

| Solubility = 8.35g/100 mL (25 °C)Sarmousakis, J. N.; Low, M. J. D. "The Solubility of Potassium Hexafluorophosphate in Water" Journal of the American Chemical Society 1955, 77, 6518. {{doi|10.1021/ja01629a031}}

}}

|Section3={{Chembox Hazards

| MainHazards = Toxic

| GHSPictograms = {{GHS05}}{{GHS07}}

| GHSSignalWord = Danger

| HPhrases = {{H-phrases|302|314|319}}

| PPhrases = {{P-phrases|260|264|270|280|301+312|301+330+331|303+361+353|304+340|305+351+338|310|321|330|337+313|363|405|501}}

| NFPA-H = 2

| NFPA-F = 0

| NFPA-R = 0

| NFPA-S =

| FlashPt =

| AutoignitionPt =

}}

}}

Potassium hexafluorophosphate is a chemical compound with the formula KPF₆. This colourless salt consists of potassium cations and hexafluorophosphate anions. It is prepared from phosphorus pentachloride:{{cite book | author = Woyski, M. M. | volume = 3 | pages = 111–117 | doi = 10.1002/9780470132340.ch29 | year = 1950 | last2 = Shenk | first2 = W. J. | last3 = Pellon | first3 = E. R. | title = Inorganic Syntheses | chapter = Hexafluophosphates of Sodium, Ammonium, and Potassium | isbn = 978-0-470-13234-0 | publisher = Inorg. Synth.}}

:{{chem2|PCl5 + KCl + 6 HF → KPF₆ + 6 HCl}}

This exothermic reaction is conducted in liquid hydrogen fluoride. The salt is stable in a hot alkaline aqueous solution, from which it can be recrystallized. The sodium and ammonium salts are more soluble in water whereas the rubidium and caesium salts are less so.

KPF₆ is a common laboratory source of the hexafluorophosphate anion, a non-coordinating anion that confers lipophilicity to its salts. These salts are often less soluble than the closely related tetrafluoroborates.