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| 融点 | 252.6 °C (lit.) | | 沸点 | > 450 °C | | 比重(密度) | 2.338 g/mL at 25 °C (lit.) | | 蒸気圧 | 0Pa at 25℃ | | 貯蔵温度 | Store at +5°C to +30°C. | | 溶解性 | H2O: 1.5 M at 20 °C, clear, colorless | | 外見 | powder | | 比重 | 2.338 | | 色 | White transparent | | PH | 4.2-4.6 (20g/l, H2O, 20℃) | | 酸解離定数(Pka) | (1) 2.15, (2) 6.82, (3) 12.38 (at 25℃) | | 臭い (Odor) | Odorless | | 水溶解度 | 222 g/L (20 ºC) | | Sensitive | Hygroscopic | | Decomposition | 253 °C | | 極大吸収波長 (λmax) | λ: 260 nm Amax: 0.046
λ: 280 nm Amax: 0.040 | | Merck | 14,7659 | | 安定性： | Hygroscopic | | InChIKey | GNSKLFRGEWLPPA-UHFFFAOYSA-M | | CAS データベース | 7778-77-0(CAS DataBase Reference) | | EPAの化学物質情報 | Monopotassium phosphate (7778-77-0) |
| | りん酸二水素カリウム Usage And Synthesis |
| 外観 | 無色の結晶又は白色の結晶性の粉末 | | 定義 | 本品は、リン酸(*)のカリウム塩であり、次の化学式で表される。
参照表示名称：リン酸 | | 溶解性 | 無色、わずかに微濁 (1.0g, 水20mL)水に溶けやすく、エタノールにほとんど溶けない。 | | 解説 | リン酸二水素カリウム[(mono)potassium dihydrogenphosphate]：KH2PO4(136.09)．略称KDP，MKP．レーザー光学分野でKDPとしてよく知られている．第一リン酸カリウム(primary potassium phosphate)ともいう．水酸化カリウム水溶液にリン酸を1：1のモル比で加え，反応液の pH を4.6に調整し，溶液を濃縮冷却すると得られる．無色の柱状正方晶系結晶．密度2.338 g cm－3．溶解度25 g/100 g 水(20 ℃)．エタノールに不溶．水溶液は弱酸性である．加熱すると258 ℃ 以上でメタリン酸カリウムとなる．結晶のC軸方向に強誘電体で圧電率が大きいので，電気材料としての用途がある．キュリー温度123 K 以下で正方晶・常誘電性から斜方晶・強誘電性に転移する．大型単結晶は圧電素子，レーザー高調波発生用の非線形光学素子として重要である．KD2PO4(D-KDP)はポッケルス・セル素子，Q-スイッチング素子として用いられる．pH 緩衝剤，肥料，醸造用添加剤，食品添加剤としても使用される． | | 用途 | 食品添加物、醸造用原料。 | | 用途 | オキシダント測定用吸収液調製用。 | | 用途 | 汎用試薬。 | | 用途 | 醸造医薬の原料、p H 調整剤 | | 用途 | 醸造医薬原料、p H 調整剤 | | 用途 | 汎用試薬、緩衝液、試液調製用原料。 | | 用途 | pH標準液調製用。 | | 用途 | 工業的には，リン酸に塩化カリウムを加えて強熱し，塩化水素および水を失って生成したメタリン酸カリウムを急冷し，その水溶液を濃縮して析出させる。結晶は強誘電体で圧電素子，電気光学素子としても重要な物質である。培養基，緩衝溶液，食品添加剤，肥料にも用いられる。鹹水原料，醸造用剤，膨張剤，調味料，pH調整剤，ペニシリン･ストレプトマイシン培養基などに用いられる。 | | 化粧品の成分用途 | pH調整剤 | | 効能 | 緩衝剤 | | 化学的特性 | White powder | | 物理的性質 | Colorless crystals or white granular powder; tetragonal structure; deliquesces; density 2.338 g/cm3; melts at 252.6°C; soluble in water 33 g/100mL at 25°C; pH 4.4-4.7; insoluble in alcohol. | | 使用 | In buffers for determination of pH. Pharmaceutic aid (buffering agent). | | 使用 | Potassium Dihydrogen is a buffer, neutralizing agent, and sequestrant. It is mildly acid, with a ph of 4.5, and fairly soluble in water, with a solubility of 25 g in 100 ml at 25°c. It is used in whole eggs for color preservation and is also used in low-sodium products, milk products, and meat products. Typical usage ranges from 0.1 to 0.5%. It is also termed monopotassium phosphate or thophosphate, potassium phosphate monobasic, and monopotassium monophosphate. | | 使用 | potassium phosphate is a humectant and pH adjuster used in cosmetic formulations. Potassium phosphate is an inorganic salt. | | 使用 | Monopotassium phosphate (MKP) is a specialty fertilizer that is a good source of phosphorus and potassium.It is an acid, chloride-free, dry soluble fertilizer,and is a natural pH buffer with a buffer pH in pure water of 4.5.Monopotassium phosphate can be solubilized and blended with liquid fertilizers that will not salt out at a low pH, and is also safe to use as a foliar fertilizer. | | 製造方法 | Monopotassium phosphate may be prepared by partial neutralization of phosphoric acid with potassium hydroxide in equimolar amounts:H3PO4+ KOH →KH2PO4+ H2O. | | 定義 | ChEBI: Potassium dihydrogen phosphate is a potassium salt in which dihydrogen phosphate(1-) is the counterion. It has a role as a fertilizer. It is a potassium salt and an inorganic phosphate. | | 一般的な説明 | Monobasic potassium phosphate crystals are colorless, soluble in water and hygroscopic in nature.Upon heating through 187°C, phase transition occurs in KH2PO4, crystal system changes from tetragonal to monoclinic, lattice parameters at 195°C are α=7.47?, b =7.33?, c =14.49?, α=?=90° and γ=92.2. | | Biochem/physiol Actions | Potassium phosphate monobasic also referred to as monopotassium phosphate or potassium dihydrogen phosphate is a soluble salt of potassium that serves as a buffering agent. It enhances the solubility of calcium and phosphorus in amino acid plus dextrose solutions and hence assists in improving the mineral balance of parenterally fed low birth weight infants. | | Solubility in organics | Insoluble to slightly soluble in ethanol, insoluble in alcohol. | | 純化方法 | Dissolve it in boiling distilled water (2mL/g), keep on a boiling water-bath for several hours, then filter it through paper pulp to remove any turbidity. Cool rapidly with constant stirring, and the crystals are collected on to hardened filter paper, using suction, washed twice with ice-cold water, once with 50% EtOH, and dried at 105o. Alternative crystallisations are from water, then 50% EtOH, and again water, or from concentrated aqueous solution by addition of EtOH. It is freed from traces of Cu by extracting its aqueous solution with diphenylthiocarbazone in CCl4, followed by repeated extraction with CCl4 to remove traces of diphenylthiocarbazone. |
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