查看“︁氟钽酸钾”︁的源代码

{{Refimprove|time=2022-02-14T02:51:27+00:00}}
{{Chembox
| Verifiedfields = changed
| Watchedfields = changed
| verifiedrevid = 444634516
| ImageFile = K2TaF7.png
| ImageSize =240
| IUPACName = Dipotassium heptafluorotantalate
| SystematicName = Dipotassium heptafluorotantalum(2-)
| OtherNames = 七氟合钽酸钾
|Section1={{Chembox Identifiers
| CASNo_Ref = {{cascite|correct|??}}
| CASNo = 16924-00-8
| ChemSpiderID_Ref = {{chemspidercite|changed|chemspider}}
| ChemSpiderID = 28541740
| EC_number = 240-986-1
| PubChem = 28146
| SMILES = F[Ta-2](F)(F)(F)(F)(F)F.[K+].[K+]
| InChI = 1S/7FH.2K.Ta/h7*1H;;;/q;;;;;;;2*+1;+5/p-7}}
|Section2={{Chembox Properties
| Formula = K<sub>2</sub>[TaF<sub>7</sub>]
| MolarMass = 392.13
| Appearance = 白色固体
| Density = 4.56 g/mL（25 °C）
| MeltingPtC = 630-820
| MeltingPt_notes = 
| BoilingPt = 
| pKa = 
| Solubility = 0.5 g/100 mL (15 °C)<ref name=Brauer>Handbook of Preparative Inorganic Chemistry, 2nd Ed. Edited by G. Brauer, Academic Press, 1963, NY. Vol. 1. p. 256.</ref>}}
|Section7={{Chembox Hazards
| ExternalSDS = 
| MainHazards = 
| NFPA-H = 
| NFPA-F = 
| NFPA-R = 
| NFPA-S = 
| LD50 = 110 mg/kg（大鼠，口服）
| PEL = 
| GHSPictograms = {{GHS06}}{{GHS07}}
| GHSSignalWord = Danger
| HPhrases = {{H-phrases|301|315|319|331|335}}
| PPhrases = {{P-phrases|261|264|270|271|280|301+310|302+352|304+340|305+351+338|311|312|321|330|332+313|337+313|362|403+233|405|501}}
 }}
}}
'''氟钽酸钾'''（Potassium fluorotantalate），分子式K<sub>2</sub>TaF<sub>7</sub>。分子量392.13。

==性质==
无色或白色[[正交晶系|正交]]针状结晶。相对密度4.56。熔点520°C。微溶于冷水和[[氢氟酸]]，可溶于热水。有毒。

==制备==
将粉碎后的钽铌矿用热浓[[硫酸]]与[[氢氟酸]]混酸溶解，经调节酸度和液-液萃取，分离出钽氟化物。使钽氟化物与[[氢氧化钾]]反应，得氟钽酸钾，再经冷却结晶、离心分离，得成品。
:<math>\ 2HF+TaF_5+2KOH\rightarrow K_2TaF_7+2H_2O</math>

==用途==
用于制取金属[[钽]]。也用作催化剂、试剂。

==参考资料==
{{reflist}}

{{钽化合物}}
{{鉀化合物}}
{{氟化物}}

[[Category:钾化合物]]
[[Category:钽化合物]]
[[Category:氟化物]]
[[Category:金属卤化物]]