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The pKa of KHP is 5.4, so its pH buffering range would be 4.4 to 6.4; however, due to the presence of the second acidic group that bears the potassium ion, the first pKa also contributes to the buffering range well below pH 4.0, which is why KHP is a good choice for use as a reference standard for pH 4.00.
The monopotassium salt, potassium hydrogen phthalate is a standard acid in analytical chemistry. Typically phthalate esters are prepared from the widely available phthalic anhydride . Reduction of phthalic acid with sodium amalgam in the presence of water gives the 1,3-cyclohexadiene derivative.
Phthalates (US: / ˈ θ æ l eɪ t s / UK: / ˈ θ ɑː l eɪ t s ˌ ˈ f θ æ l ɪ t s / [1] [2]), or phthalate esters, are esters of phthalic acid. They are mainly used as plasticizers , i.e., substances added to plastics to increase their flexibility, transparency, durability, and longevity.
It is commonly made by neutralizing picric acid with potassium carbonate. It has been used in industry since the 1860s. [1] Potassium Picrate and picric acid were formerly used in pyrotechnics to produce whistle effects, but since mixes that don't involve primary explosives have since been developed it is no longer used in that industry.
Monopotassium phosphite is an inorganic compound with the formula KH 2 PO 3.A compositionally related compound has the formula H 3 PO 3. 2(KH 2 PO 3).Both are white solids that consist of salts of the phosphite anion H 2 PO 3 −, the conjugate base of phosphorous acid.
Potassium phthalimide is a chemical compound of formula C 8 H 4 KNO 2. It is the potassium salt of phthalimide , and usually presents as fluffy, very pale yellow crystals. It can be prepared by adding a hot solution of phthalimide in ethanol to a solution of potassium hydroxide in ethanol; the desired product precipitates.
In KNH 2 ·2NH 3, the potassium centers are each bonded to two amido ligands and four ammonia ligands, all six of which bridge to adjacent potassium centers. The result is a chain of hexacoordinate potassium ions. The K– NH 2 distances are 2.7652(11) whereas the K– NH 3 distances are respectively 2.9234(11) and 3.0698(11) Å. [4]
The relevant conversion is the exothermic reaction of potassium chloride and sulfuric acid: [1] [2] KCl + H 2 SO 4 → HCl + KHSO 4. Potassium bisulfate is a by-product in the production of nitric acid from potassium nitrate and sulfuric acid: [3] KNO 3 + H 2 SO 4 → KHSO 4 + HNO 3
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